Marketing External Environments :: essays research papers

I ¡Ã‚ ¦m not sure if I am taking the right definition of  ¡Ã‚ §external environments ¡Ã‚ ¨ in my answer, but I will talk about them in the way I have learned about them before. There are always a number of external factors that affect customers, and if a marketing team is good they will take all of them into consideration. Demographics: Defined as: The characteristics of human populations and population segments, especially when used to identify consumer markets. I think this is one of the most important factors to look at because in take into account many things about the population including, but not limited to:  Ã‚  Ã‚  Ã‚  Ã‚   Æ’Ã ¦Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Race Æ’Ã ¦Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Gender Æ’Ã ¦Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Average Income Æ’Ã ¦Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Location Æ’Ã ¦Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Population This makes a huge difference in marketing because marketing to middle aged Hispanic females may need a totally different campaign then elderly white males, although they may both be interested in the product. This is generally used in the initial stages of planning to decide if a certain area will even be profitable to market in. Political Factors: Depending on the political group of the area there may be bans on certain advertising or activities. Certain businesses may be supported more by specific political groups. For example a gun shop may flop in a more democratic area but be a huge success in a primary republican area. You could compare say, Texas and Massachusetts. In Republican Texas the gun ownership percentage is much, much higher then in Democratic Massachusetts. Economic Factors: This includes things like interest rates, exchange rates, government policies on taxation and spending, among other things. One of the most common examples of this is car dealerships advertising  ¡Ã‚ §Lowest Interest Rates Ever! ¡Ã‚ ¨ It may be much more successful to push a product more when interest rates are lower, and more appealing to consumers. Technological Factors: The technological world is booming, products are moving from Version 1.5 to Version 6.7 in a matter of months. With so much new technology being introduced it ¡Ã‚ ¦s important to remain user friendly, cost conscious, and efficient. Competitors: This one is huge. Companies and consumers alike need to be aware of the competing business in the area. Cost conscious consumers will look in flyers to see if Big Y or Stop and Shop has cheaper grapes, and the businesses need to be aware of this so they can appeal to the customer in a way the other business is not. If there are competing businesses in a specific area, you will RARELY see one advertise and the other abstain, for the simple fact that you need to do everything your competitor is doing and then some.

Internet Censorship :: essays research papers

Internet Censorship For centuries governments have tried to regular materials deemed inappropriate or offensive. The history of western censorship was said to have begun when Socrates was accused "firstly, of denying the gods recognized by the State and introducing new divinities, and secondly of corrupting the young." He was sentenced to death for these crimes. Many modern governments are attempting to control access to the Internet. They are passing regulations that restrict the freedom people once took for granted. The Internet is a world wide network that should not be regulated or censored by any on country. It is a complex and limitless network which allows boundless possibilities and would be effected negatively by the regulations and censorship that some countries are intent on establishing. Laws that are meant for other types of communication will not necessarily apply in this medium. There are no physical locations where communications take place, making it difficult to determine where violations of the law should be prosecuted. There is anonymity on the Internet and so ages and identities are not known this makes it hard to determine if illegal activities are taking place in regards to people under the legal age. As well, it is difficult to completely delete speech once it has been posted, Meaning that distributing materials that are obscene are banned becomes easy The American Library Association (ALA) has a definition that states censorship is â€Å"the change in the access status of material, made by a governing authority or its representatives. Such changes include: exclusion, restriction, remove, or age/grade level changes.† This definition, however, has a flaw in that it only recognizes one form of censorship-governmental censorship. Cyberspace, a common name for the Net, has been defined by one author as being "made up of millions of people who communicate with one another through computers. It is also "information stored on millions of computers worldwide, accessible to others through telephone lines and other communication channels "that" make up what is known as cyberspace." The same author went on to say " term itself is elusive, since it is not so much a physical entity as a description of an intangible." The complexity of the Internet is demonstrated through its many components. The most readily identifiable part is the World Wide Web (WWW). This consists of web pages that can be accessed through the use of a web browser. Web pages are created using a basic programming language. Another easily identified section of the Internet is e-mail. Once again it is a relatively user-friendly communication device. Some other less publicized sections of the Internet include: Internet Relay Chat (IRC), which allows real time chatting to

Criminology Gender Blind

‘’Is criminology â€Å"gender-blind† : women and crime’’ Brilly Amancio 04-10-2013 Criminal Justice 212 Criminology Prof: Christopher Geraghty Brilly Amancio Is criminology â€Å"gender-blind† : women and crime( by and against) Woman in Criminology has a really big change from back in the days till now. Before woman where not that involved in crime either if it was in the good side like being a cop, detective, lieutenant, or of it was in the bad side, as to being the one committing the crime. Criminology, as with all academic disciplines, was a male-dominated sphere.Men regarded the world through a very narrow lens, and the experiences of women rarely provoked serious interest. Back in the days woman where more likely to stay home, cook, take care of kids and wait for their husbands to get home, not even work. Woman were not much socialized with society other than other woman and did not spend much time in the streets as men did. Woman were no t viewed as a big factor in society rather than the male which was the man working to bring food home. There were not much activity for a woman to be out in the streets much as too like sports and obs. Very few of them would practice one of those options. Where woman were mostly considered as as a criminal was with prostitution. This was the most popular crimes for woman since it was hard to find a woman or a young girl being in a gang since back in the days there was more discipline with kids and woman depended on their husbands. Men were more involved in crimes since they were in the streets more, hanging out with friends, playing sports or working since women were not really able to work much or just believes were much different back then. Most police officers, etectives, judges or anything involved with law enforcement were men. Now a days everything is equal, there is as much woman involved in crimes and the law enforcement just like men. Ever since woman became more independen t they have been more involved in crimes as such as stealing, murdered, kid napping and a ton of different other crimes. When woman first started getting more involved in crimes was more with an influence of men. Either a lover or close friends. Now they make their decisions to be involved in crimes by themselves just like men do. Accordin g to www. ukdissertation. om and this is their explination of why there are more woman in jail right now ‘’ Carlen summarises the responses given as thus: (1) more women are committing violent crimes; (2) more women who would not have previously gone to prison are going due to increasing involvement with drugs; (3)more black women are going to prison so racism may be the key; or (4)prison is being used to incarcerate the same social categories for women that it always has – the destitute, the most obviously gender deviant, and the mentally disturbed – but the numbers of women presenting themselves in these categories ave increased with growing economic inequality (Carlen, 1998: 51). Another explanation is that women are becoming more violent, indeed the proportion of female prisoners under sentence for crimes of violence against the person was indeed (at 20 per cent) only two present less than the proportion of male prisoners. Fletcher (1975, in Carlen, 1998: 52) supports this view: ‘It is undoubtedly the case that the level of convictions of violence against the person has increased among women. ’ However, he also points out that, ‘the female prison population has †¦ risen steeply whilst serious convictions have actually allen’; suggesting that this may be due to longer sentences being served. As will be seen later, it is much more likely that it is the increase in more punitive sentencing for trivial crimes that is more likely to offer an explanation. Things have changed a lot over the last couple of years. But this does not mea that woman are punished just as the s ame as men are. According to Wikipedia men are more likel to become incarcerated then woman would and this is their their facts ‘’ In the United States, men are much more likely to be incarcerated than women.Nearly 9 times as many men (5,037,000) as women (581,000) had ever at one time been incarcerated in a State or Federal prison at year end 2001. However, women are the fastest-growing demographic group in prison. [1]. In 2004,  males  were almost 10 times more likely than  females  to commit  murder, including rape-homicides. However, men are also far more likely than women to be the victims of violent crime, with the exception of rape. There my be a lot of explanations for this like men are more likely to be more aggressive than woman so they tend to get in more altercations and tend to act out of rage more than oman do. Young teenagers have become really popular in the juvenile system. The number of female teenagers has increased a lot in the juvenile sys tem as to the number of female teenagers that are dropping out of school or just kicked out for their irrational behavior. Still so male is the biggest crime predator in everyone’s eye, everyone is conscious of how the number of female criminal has increased men is still the number one target. I this unfair? Yes it is yes in a lot of cases woman are treated harshly but like like in every case that males do. Bibliography: http://en. wikipedia. rg/wiki/Sex_differences_in_crime http://www. routledge. com/books/details/9780415644174/ http://www. roxbury. net/womencrime. html http://www. law-essays-uk. com/resources/sample-essays/criminology/gender-and-crime. php http://books. google. com/books? id=r3IMdD2xZ8MC&pg=PA265&lpg=PA265&dq=Is+criminology+%22gender-blind%22+:+women+and+crime(+by+and+against)&source=bl&ots=AZphi3RxKq&sig=BaNiS4rUFnLVygUIWcLrQSjtWeI&hl=en&sa=X&ei=BJNkUezPK87y0wGF74EQ&ved=0CG4Q6AEwCQ#v=onepage&q=Is%20criminology%20%22gender-blind%22%20%3A%20women%20and%20cri me(%20by%20and%20against)&f=false

Bio100 Midterm Study Guide

7 properties of Life |Description/Examples | | Order |All living things exhibit complex but ordered organization; structure of a pinecone | |Regulation |The environment outside of the organism may change drastically, but the organism can adjust its internal | | |environment keeping it within appropriate limits; temperature (shivering and sweating) | |Growth & Development |Information carried by genes controls the growth and development in all organisms | |Energy Utilization |Organisms take in energy and use it to perform all of life’s activities; Puffin eating fish to have energy| | |to swim | |Response to the |All organisms respond to environmental stimuli; Venus fly trap shutting when a fly touches its hairs | |environment | | |Reproduction |Organisms reproduce their own kind; hippos only reproduce hippos | |Evolution |Reproduction underlies the capacity to evolve over time; a bug changes over time to camouflage to its | | |environment | Levels of organization in the livin g world: 1. Biosphere 2. Ecosystem6. Organs-Organ Systems 3. Communities7. Tissues 4. Population8. Cells 5. Organism9. Organelles 10. Molecules and Atoms Homeostasis- The steady state of body functioning; the tendency to maintain relatively constant conditions in the internal environment even when the external environment changes. Homeostasis is dependent on negative feedback to give it signals to regulate; when a thermostat recognizes the temp has dropped it cues the heater to kick on.In negative feedback, a change in a specific variable triggers a mechanism that will reverse the change. Ecosystem Nutrients are recycled; water, minerals, carbon dioxide and decomposed organisms are used and recycled back in to the ecosystem Energy flows through; sunlight is used for photosynthesis which produces 02 Producers are photo synthesizers. Producers convert the sun’s energy to chemical energy of sugars and complex molecules. The sun enters as light and is converted to heat which is r eleased back into the ecosystem. Taxonomy- the branch of biology that identifies names and classifies species. Names are 2 parts (binomial), genus and species. Closely related species are grouped into a genus.Prokaryotic and Eukaryotic Cells |Characteristics |Prokaryotic Cells |Eukaryotic Cells | |Nucleus |No |Yes | |Cell Size |Very small |Larger | |Complexity (organelles) |Low complexity |Many | |Examples of organisms with these cells |Bacteria, archaea |Animals, humans, plants, fungus, protists | Domain Characteristics- 3 domains Domains |Archaea |Bacteria |Eukarya | |Distinguishing |Exist in extreme conditions |No nucleus |Nucleus | |characteristics |No nucleus |Cell walls contain |Unique rRNA to Eukarya| | |Single celled |peptidoglycan | | | |Cell walls contain no peptidoglycan |Unique rRNA to Bacteria | | | |Unique rRNA to Archaea | | | | |Cell membrane is made of branched hydrocarbon chains | | | | |attached to glycerol by ether links | | | |Examples of organisms |Pyrolobus fu marii, methanogens |e. Coli |Protists, plants, | |found in this domain | | |fungi, animals | Plantae- plants are photosyntheticProtist- unicellular organisms Cell structures common to both plant and animal cells: Ribosomes, golgi apparatus, plasma membrane, nucleus Unique to plants- chloroplasts, cell walls, central vacuole Unique to animals- centriole, lysosome, flagellum Evolution Evolution is the changing of organisms to produce the best offspring and have the best traits, leading to a better species of the organism; responsible for the unity and diversity in life. Darwin’s main point: Modern species descended from ancestral species, and organisms evolve by natural selection. Artificial selection accounts for the different breeds of domesticated dogs. (selective breeding)Natural Selection (mechanism of Evolution) |Observation/deduction |What does it say? | | |What does it mean? | |Observation1- Overproduction and competition |There are only so many resources available for species to live | | |on. When they over produce they will have to compete for the | | |resources; the strongest will survive | |Observation 2- Individual variation |Each ndividual within a species is different, with different | | |traits. Stronger, weaker, smarter, faster, slower. | |Conclusion- Unequal reproductive Success |The individuals with the best traits will be the ones to get the | | |resources and survive and be able to pass on these traits through| | |their offspring, leading to a species better adapted to their | | |environment. | Hypothesis driven science Scientific Process |Definition/Description |Example from rat experiment in Lab 1 lesson| | | |page | |Observation |Observing something |Rats at local pet store seem to all run in | | | |a clockwise direction on their wheels | |Questioning |Questioning that observation |Do all rats prefer to run in a clockwise | | | |direction? | |Hypothesis |A proposed explanation for a set of |There is no difference in preferen ce by | | |observations |rats as to which direction (clockwise or | | | |counterclockwise) they run on an exercise | | | |wheel. |Testing |Experiment |A sample of 100 rats (minimum sample size | | | |is 30) were selected at random for the | | | |experiment. They were split into different | | | |groups (control and experimental). The | | | |experiment was conducted multiple times by | | | |several researchers to ensure that the | | | |results were reproducible.Every rat in | | | |both groups was observed to run in a | | | |clockwise direction and therefore, the null| | | |hypothesis was rejected. | |Explanation |Conclusion to the experiment results-proven|Rats do have a preference as to the | | |or disproving the hypothesis |direction in which they run on the exercise| | | |wheel; they prefer to run clockwise. | Theory vs. Hypothesis- a theory must be supported by evidence. A good hypothesis must be falsifiable. Measurements | |Prefix |Symbol |Relation to base unit | |A. kilo |k |x 1 ,000 (1 k = 1,000 m) | |B. |centi |c |1/100 (1 cm = 0. 01 m) | |C. |milli |m |1/1000 (1 ml = 0. 001 l) | |D. |micro | µ |1/1,000,000 | |E. |nano |n |1/1,000,000,000 | The following are thus equivalent: 575 nm, 0. 575  µm, 0. 000575 mm, 0. 0000575 cm, 0. 000000575 m, and 0. 000000000575 km. Likewise 4. 63 kg is equal to 4,630 g and 463,000 cg. Temperature is usually recorded in degrees Celsius ( °C). On the Celsius scale, the boiling point of water is 100 ° and the freezing point of water is 0 °.The common temperature conversion formulae are:  °C = ( °F – 32) x 5/9 and  °F = ( °C x 9/5) + 32 Electrons- subatomic particles with a single unit of negative electric charge that play the greatest role in cellular chemical reactions and determine the chemical properties of an atom or molecule. Innermost shell can hold a maximum of 2 electrons. One or more electrons move around the nucleus of an atom. Source of energy that pumps hydrogen ions across the inner mitocho ndrial membrane Atom- the structural unit that retains the properties of an element. Becomes an ion when it gains or loses electrons. Composed of protons, electrons and neutrons.Proton- subatomic particle w/ a single unit of positive electrical charge. Electron- subatomic particle w/ a single unit of negative electrical charge. Neutron- Electrically neutral The number of electrons in the outermost shell determines the chemical properties of an atom. Atoms whose outer shells are not full tend to interact with other atoms- that is, to participate in chemical reactions. The innermost shells is full with only 2 electrons, while the second and third shells can each hold up to 8 electrons. Molecule- A group of two or more atoms held together by covalent bonds. Isotopes differ in their mass number 3CO? is three molecules of carbon dioxide.Carbon is organic |Type of Bond |How they form |Examples | |Ionic |Transfer of electrons that happen through |Table salt | | |the attraction of oppositel y charges ions | | | |such as positive calcium and negative | | | |fluoride. | | |Covalent |When one atom shares its electrons with |Methane | | |another atom. | | |Hydrogen |Occurs in water between a hydrogen and |Water | | |oxygen atom in a different molecule.A type| | | |of weak chemical bond formed when a | | | |partially positive hydrogen atom from one | | | |polar molecule is attracted to the | | | |partially negative atom in another molecule| | | |(or in another part of the same molecule). | | Water- 2 hydrogen atoms, 1 oxygen atom- is an important solvent in life because it forms hydrogen bonds. pH 7 because it is neither acidic or basic. Cohesion- The tendency of water molecules of the same kind to stick together.The strength of hydrogen bonds between water molecules allows for surface tension (spider walking on water) pH- 0 is acidic- greater H+ concentration, water is 7- equal H+ and OH+ concentration (neutral) and 14 is Basic- lower H+ concentration.. Carbon is an import ant molecule for life because it can form chemical bonds with a maximum of 4 other atoms. 4 electrons in its outermost shell (can hold 8), needs 8 to be stable and it gets the electrons by covalent bond Centrioles – Every animal-like cell has two small organelles. They are there to help the cell when it comes time to divide. They are put to work in both the process of mitosis and the process of meiosis.You will usually find them near the nucleus but they cannot be seen when the cell is not dividing. Made of Microtubules. Hydrocarbon- the simplest organic compounds which contain only carbon and hydrogen atoms. Hydrolysis- breaking of a long chain compound into its subunits by adding water to the structure between its subunits. Adding a water molecule to split two sugars apart. Consumes water. Changes polymer to monomer Dehydration reaction- A chemical process in which a polymer forms when monomers are linked by the removal of water molecules. One molecule of water is removed f or each pair of monomers linked. A dehydration reaction is the opposite of a hydrolysis reaction.Carbohydrate monomers are united into a polymer by means of dehydration synthesis Carbohydrate- A biological molecule consisting of simple single-monomer sugars (monosaccharide), two-monomer sugars (disaccharides), and other multi-unit sugars (polysaccharides). Proteins- made of amino acids. Hair and muscle. Act as enzymes. Proteins function depends on its shape Lipids-fats (oils) and steroids (cholesterols. Stores energy and produces other steroids. Fat is made of glycerol with 3 fatty acid molecules (triglycerides). Mitochondria are known as the powerhouses of the cell. They are organelles that act like a digestive system that takes in nutrients, breaks them down, and creates energy for the cell. Nucleic acids- DNA and RNA, provides the directions for building proteins. Made of nucleotides.A>T and G>C Polysaccharides- sugars Soften a fat- create more double bonds with carbon atoms in t he fatty acid chains. More hydrogen atoms in saturated fats make them remain solid at room temp. Enzyme- may contain the organic molecule –NH?. Special type of protein that causes metabolic reactions to proceed at a much greater rate than they normally would. Their function depends upon their three-dimensional shape. Three factors that can affect the observance of enzymes is temperature, pH and the presence of catalase. A protein that serves as a biological catalyst, changing the rate of a chemical reaction without itself being changed in the process. DNA- made up of nucleotides.DNA makes RNA; RNA makes protein Benedict’s test- reducing sugars, green, yellow, red is positive. Blue is negative Sudan III test- testing for fat, red spot is positive Biuret test- protein, pink or purple is positive Iodine test- starch, positive is dark brown or black Hydrogen Peroxide- enzyme activity (liver, lunch meat) bubbles are positive Robert Hooke- first to use the term cell to descr ibe the basic unit of life. Surface to Volume ratio (Surface area / Volume)- a small cell has a larger sa>v ration than a larger cell. When the outside surface area is smaller than the inside volume the cell cannot pass material in and out as effectively as when the surface area is larger than the volume | CUBE 1 |CUBE 2 | |Surface Area: |1cm x 1cm x 6 sides = 6cm2 |10cm x 10cm x 6 sides = 600cm2 | |Volume: |1cm x 1cm x 1cm = 1cm3 |10cm x 10cm x 10cm = 1000cm3 | |SA/V: |6cm2/1cm3 = 6. 0 cm2/cm3 |600cm2/1000cm3 = . 6cm2/cm3 | |Rf = |Distance the pigment traveled | |   |Distance the solvent traveled | | |  Ã‚  Ã‚  (solvent front will be near the paper clip) | For example, if the solvent travels 10 cm, and the pigment travels 3 cm, the Rf value for that pigment would be: 3 cm/10 cm = 0. 3000 (four decimal places) Ribosomes- found on the surface of Rough ER. Synthesizes protein Nucleus- contains and replicates DNANuclear membrane- the â€Å"envelope† there is pores and spaces for RNA and proteins to pass through while the nuclear envelope keeps all of the chromatin and nucleolus inside. Cytoskeleton- maintains cell shape, anchors organelles, and moves parts of the cell. A meshwork of fine fibers in the cytoplasm of a eukaryotic cell; includes microfilaments, intermediate filaments, and microtubules. Cell walls; plant cell walls are composed of cellulose. A protective layer external to the plasma membrane in plant cells, bacteria, fungi, and some protists; protects the cell and helps maintain its shape. Cell membranes are composed of lipids and proteins; it separates the cell from its surroundings.Called the Fluid Mosaic† because molecules can move freely past one another and mosaic because of the diversity of proteins that float like icebergs in a phospholipids sea. Cytoplasm- Everything inside a eukaryotic cell between the plasma membrane and the nucleus; consists of a semi fluid medium and organelles; can also refer to the interior of a prokaryo tic cell. Chloroplasts- the organelles that perform photosynthesis in plant cells and some protists. Located in the cytoplasm within the plasma membrane. Enclosed by two concentric membranes, a chloroplast absorbs sunlight and uses it to power the synthesis of organic food molecules (sugars).Chlorophyll- A green pigment in chloroplasts that participates directly in the light reactions. Chlorophyll a-the chlorophyll that is used during light reaction and is in the reaction center of the photosystem Chlorophyll b- broadens the range of light a plant can use Carotenoids- absorbs extra light that could damage the chlorophyll Anthocyanin- protects the plant from UV damage Genes- Chromosomes are made up of DNA. Segments of DNA in specific patterns are called genes. Your genes make you who you are. You will find the chromosomes and genetic material in the nucleus of a cell. In prokaryotes, DNA floats in the cytoplasm in an area called the nucleoid. Lysosome- aids is digestion Plasma membra ne- major lips are phospholipids.The thin layer of lipids and proteins that sets a cell off from its surroundings and acts as a selective barrier to the passage of ions and molecules into and out of the cell; consists of a phospholipid bilayer in which proteins are embedded. Golgi apparatus- protein modification. An organelle in eukaryotic cells consisting of stacks of membranous sacs that modify, store, and ship products of the endoplasmic reticulum. Central vacuole- A membrane-enclosed sac occupying most of the interior of a mature plant cell, having diverse roles in reproduction, growth, and development. Aids in storage Microtubules- cell shape Nucleolus- The nucleolus is a non-membrane bound structure [composed of proteins and nucleic acids found within the nucleus. Ribosomal RNA (rRNA) is transcribed and assembled within the nucleolus.Cilia- hair-like structures on the outside of a cell that create movement through a back and forth motion Flagella- tail-like structure on the ou tside of the cell that helps move the cell along Food vacuole- sac that buds from the plasma membrane to help the lysosome release enzymes that digest the food molecules that provides energy to the cell. Cellular respiration- conversion of the energy stored in food molecules to energy stored in ATP. Glucose is used as food and carbon dioxide is produced as waste. Formula is 6CO2 + 6H2O =C6H12O6+6O2 (6 molecules carbon dioxide + 6 molecules water=1 molecule sugar + 6 molecules oxygen). Cellular respiration varies from breathing because it is required to share 2 gases with its surroundings and breathing shares 2 gases between blood and surroundings. Stages are Glycolysis, Citric Acid Cycle and Electron Transport Aerobic= 4, anerobic= 34Cellular responses involve transduction of an external signal Paramecium- single celled organism (Protist) with a nucleus (eukaryotic cell) and small hair-like structures (cilia) Osmosis- water moves from the lower solute concentration to the higher sol ute concentration. A type of passive diffusion where water moves down the concentration gradient through a semi-permeable membrane. Hypertonic- In comparing two solutions, referring to the one with the greater concentration of solutes. Hypotonic- In comparing two solutions, referring to the one with the lower concentration of solutes. If a cell is placed in it, water will move into the cell from the surrounding solution. Energy- capacity to perform workKinetic energy- energy of motion (muscle moving) potential energy- Energy that something has because of its location. A rock on the top of the mountain contains potential energy entropy- the measure of the amount of disorder or randomness in a situation Principles of conservation of energy- it is not possible to create or destroy energy. Can only be converted from one form to another. ATP molecules- main energy carriers in cells. ATP synthesis occurs in the mitochondrion Active transport requires ATP, passive does not. Facilitated tra nsport occurs by means of transport proteins Diffusing molecules move down their concentration gradients until they are evenly distributed.If a human cell were placed in water, it sells because water is diffusing across the plasma membrane from a region of high concentration outside the cell to a region of low concentration inside the cell. Endocytosis- The movement of materials in to the cell Exocytosis- The movement of materials of out the cytoplasm of a cell via membranous vesicles or vacuoles Phagocytosis is a type of endocytosis in which a cell engulfs another cell. A cell engulfs a particle by wrapping pseudopodia around it and packaging it within the vacuole Pinocytosis- cellular drinking Receptor-Mediated Endocytosis – the movement of specific molecules into the cell by inward budding vesicles. The vesicles contain proteins with receptor sites specific to the molecules being taken in.Polypeptide- a chain of amino acids that have been linked together by dehydration syn thesis Light reactions take place in the thylakoid membrane. Source of electrons is H? O. The first of two stages in photosynthesis, the steps in which solar energy is absorbed and converted to chemical energy in the form of ATP and NADPH. The light reactions power the sugar-producing Calvin cycle but produce no sugar themselves. Photosynthesis- light excites the electrons in chlorophyll to a higher energy state. Energy is released and used to create ATP when electrons are passed down the energy hill during the light dependant reactions. The process by which plants, algae, and some bacteria transform light energy to chemical energy stored in the bonds of sugars made from carbon dioxide and water. CO2 + 6H2O =C6H12O6+6O2 (6 molecules carbon dioxide + 6 molecules water=1 molecule sugar + 6 molecules oxygen) Calvin Cycle- makes sugars during photosynthesis in the Stroma. The Calvin Cycle uses the products of the light reactions (which are ATP and NADPH) to power the production of sugar from carbon dioxide. The enzymes in the Calvin cycle are dissolved in the Stroma, the thick fluid within the chloroplast. ATP generated by the light reactions provides the energy for sugar synthesis. And the NADPH produced by the light reactions provides the high-energy electrons for the reduction of carbon dioxide to Glucose. Thus, the Calvin cycle indirectly depends on light produce sugar because it requires the supply of ATP and NADPH produced by the light reactions.Energy transfer- pigment molecules>chlorophyll a> primary electron acceptor Electron transport train- electrons pass from one carrier to another, releasing a little energy at each step Photosystem- A light-harvesting unit of a chloroplast's thylakoid membrane; consists of several hundred antenna molecules, a reaction-center chlorophyll, and a primary electron acceptor. Rough ER was mentioned in the section on ribosomes. They are very important in the synthesis and packaging of proteins. Some of those proteins might b e used in the cell and some are sent out. The ribosomes are attached to the membrane of the ER. As the ribosome builds the amino acid chain, the chain is pushed into the ER. When the protein is complete, the rough ER pinches off a vesicle. That vesicle, a small membrane bubble, can move to the cell membrane or the Golgi apparatus. Smooth ER- has its purpose in the cell. It acts as a storage organelle. It is important in the creation and storage of steroids.It also stores ions in solution that the cell may need at a later time. vesicle is a bubble of liquid within another liquid, a supramolecular assembly made up of many different molecules. More technically, a vesicle is a small membrane-enclosed sack that can store or transport substances. Vesicles can form naturally because of the properties of lipid membranes (see micelle), or they may be prepared. Artificially prepared vesicles are known as liposomes. Most vesicles have specialized functions depending on what materials they cont ain. Water-splitting photosystem when oxygen is produced Osmoregulation- animal’s ability to survive if its cells are exposed to hypertonic or hypotonic environment

Final Exam Ec315

PART I. HYPOTHESIS TESTING PROBLEM 1 A certain brand of fluorescent light tube was advertised as having an effective life span before burning out of 4000 hours. A random sample of 84 bulbs was burned out with a mean illumination life span of 1870 hours and with a sample standard deviation of 90 hours. Construct a 95 confidence interval based on this sample and be sure to interpret this interval. Answer Since population standard deviation is unknown, t distribution can be used construct the confidence interval. ? The 95% confidence interval is given by ? X ? t? / 2,n ? 1 ? S S? , X ? ? /2,n ? 1 ? n n? Details Confidence Interval Estimate for the Mean Data Sample Standard Deviation Sample Mean Sample Size Confidence Level 90 1870 84 95% Intermediate Calculations Standard Error of the Mean 9. 819805061 Degrees of Freedom 83 t Value 1. 988959743 Interval Half Width 19. 53119695 Confidence Interval Interval Lower Limit 1850. 47 Interval Upper Limit 1889. 53 2 PROBLEM 2 Given the following data from two independent data sets, conduct a one -tail hypothesis test to determine if the means are statistically equal using alpha=0. 05. Do NOT do a confidence interval. 1 = 35 n2 = 30 xbar1= 32 xbar2 = 25 s1=7 s2 = 6 Answer H0:Â µ1=Â µ2 H1: Â µ1>Â µ2 Test statistics used is t ? X1 ? X 2 S 2 (n1 ? 1) S12 ? (n2 ? 1) S2 n1n2 ~ tn1 ? n1 ? 2 where S ? n1 ? n2 ? 2 n1 ? n2 Decision rule : Reject the null hypothesis, if the calculated value of test statistic is greater than the critical value. Details t Test for Differences in Two Means Data Hypothesized Difference Level of Significance Population 1 Sample Sample Size Sample Mean Sample Standard Deviation Population 2 Sample Sample Size Sample Mean Sample Standard Deviation 0 0. 05 35 32 7 30 25 6Intermediate Calculations Population 1 Sample Degrees of Freedom 34 Population 2 Sample Degrees of Freedom 29 Total Degrees of Freedom 63 Pooled Variance 43. 01587 Difference in Sample Means 7 t Test Statistic 4. 289648 Upper-Tail Test U pper Critical Value p-Value Reject the null hypothesis 1. 669402 3. 14E-05 Conclusion: Reject the null hypothesis. The sample provides enough evidence to support the claim that means are different. 3 PROBLEM 3. A test was conducted to determine whether gender of a display model af fected the likelihood that consumers would prefer a new product.A survey of consumers at a trade show which used a female spokesperson determined that 120 of 300 customers preferred the product while 92 of 280 customers preferred the product when it was shown by a female spokesperson. Do the samples provide sufficient evidence to indicate that the gender of the salesperson affect the likelihood of the product being favorably regarded by consumers? Evaluate with a two-tail, alpha =. 01 test. Do NOT do a confidence interval. Answer H0: There no significant gender wise difference in the proportion customers who preferred the product.H1: There significant gender wise difference in the proportion customers who preferred the product. P ? P2 n p ? n p 1 The test Statistic used is Z test Z ? where p= 1 1 2 2 n1 ? n2 ?1 1? P(1 ? P) ? ? ? ? n1 n2 ? Decision rule : Reject the null hypothesis, if the calculated value of test statistic is greater than the critical value. Details Z Test for Differences in Two Proportions Data Hypothesized Difference Level of Significance Group 1 Number of Successes Sample Size Group 2 Number of Successes Sample Size 0 0. 01 Male 120 300 Female 92 80 Intermediate Calculations Group 1 Proportion 0. 4 Group 2 Proportion 0. 328571429 Difference in Two Proportions 0. 071428571 Average Proportion 0. 365517241 Z Test Statistic 1. 784981685 Two-Tail Test Lower Critical Value -2. 575829304 Upper Critical Value 2. 575829304 p-Value 0. 074264288 Do not reject the null hypothesis Conclusion: Fails to reject the null hypothesis. The sample does not provide enough evidence to support the claim that there significant gender wise difference in the proportion customers who preferr ed the product. 4PROBLEM 4 Assuming that the population variances are equal for Male and Female GPA’s, test the following sample data to see if Male and Female PhD candidate GPA’s (Means) are equal. Conduct a two-tail hypothesis test at ? =. 01 to determine whether the sample means are different. Do NOT do a confidence interval. Male GPA’s Female GPA’s Sample Size 12 13 Sample Mean 2. 8 4. 95 Sample Standard Dev .25 .8 Answer H0: There is no significant difference in the mean GPA of males and Females H1: There is significant difference in the mean GPA of males and Females. Test Statistic used is independent sample t test. ? X1 ? X 2 S 2 (n1 ? 1) S12 ? (n2 ? 1) S2 n1n2 ~ tn1 ? n1 ? 2 where S ? n1 ? n2 ? 2 n1 ? n2 Decision rule: Reject the null hypotheses, if the calculated value of test statistic is greater than the critical value. Details t Test for Differences in Two Means Data Hypothesized Difference Level of Significance Population 1 Sample Sample Size Sample Mean Sample Standard Deviation Population 2 Sample Sample Size Sample Mean Sample Standard Deviation Intermediate Calculations Population 1 Sample Degrees of Freedom Population 2 Sample Degrees of Freedom Total Degrees of Freedom Pooled Variance 0. 05 12 2. 8 0. 25 13 4. 95 0. 8 11 12 23 0. 363804 5 Difference in Sample Means t Test Statistic -2. 15 -8. 90424 Two-Tail Test Lower Critical Value Upper Critical Value p-Value Reject the null hypothesis -2. 80734 2. 807336 0. 0000 Conclusion: Reject the null hypotheses. The sample provides enough evidence to support the claim that there is significant difference in the mean GP A score among the males and females. 6 PART II REGRESSION ANALYSIS Problem 5 You wish to run the regression model (less Intercept and coefficients) shown below: VOTE = URBAN + INCOME + EDUCATEGiven the Excel spreadsheet below for annual data from1970 to 2006 (with the data for row 5 thru row 35 not shown), complete all necessary entries in the Excel Regress ion Window shown below the data. 1 2 3 4 A YEAR 1970 1971 1972 B VOTE C URBAN D INCOME E EDUCATE 49. 0 58. 3 45. 2 62. 0 65. 2 75. 0 7488 7635 7879 4. 3 8. 3 4. 5 36 37 38 2004 2005 2006 50. 1 92. 1 94. 0 95. 6 15321 15643 16001 4. 9 4. 7 5. 1 67. 7 54. 2 Regression Input OK Input Y Range: A1:A38 Input X Range: B1:E38 Cancel Help ? Labels Confidence Level: x X X Output options X Constant is Zero 95 % Output Range: New Worksheet Ply:New W orkbook Residuals Residuals Residual Plots Standardized Residuals Line Fit Plots Normal Probabilit y Normal Probability Plots 7 PROBLEM 6. Use the following regression output to determine the following: A real estate investor has devised a model to estimate home prices in a new suburban development. Data for a random sample of 100 homes were gathered on the selling price of the home ($ thousands), the home size (square feet), the lot size (thousands of square feet), and the number of bedrooms. The following multiple regression output was generated: Regression Statistics Multiple R 0. 8647 R Square . 7222 Adjusted R Square 0. 6888 Standard Error 16. 0389 Observations 100 Intercept X1 (Square Feet) X2 (Lot Size) X3 (Bedrooms) Coefficients -24. 888 0. 2323 11. 2589 15. 2356 Standard Error 38. 3735 0. 0184 1. 7120 6. 8905 t Stat -0. 7021 9. 3122 4. 3256 3. 2158 P-value 0. 2154 0. 0000 0. 0001 0. 1589 a. Why is the coefficient for BEDROOMS a positive number? The selling price increase when the number of rooms increases. Thus the relationship is positive. b. Which is the most statistically significant variable? What evidence shows this? Most statistically significant variable is one with least p value.Here most statistically significant variable is Square feet. c. Which is the least statistically significant variable? What evidence shows this? Least statistically significant variable is one with high p value. Here least statistically significant variable is bedrooms d. For a 0. 05 level of significance, should any variable be droppe d from this model? Why or why not? The variable bed rooms can be dropped from the model as the p value is greater than 0. 05. e. Interpret the value of R squared? How does this value from the adjusted R squared? The R2 gives the model adequacy. Here R2 suggest that 72. 22% variability can e explained by the model. Adjusted R2 is a modification of R2 that adjusts for the number of explanatory terms in a model. Unlike R2, the adjusted R2 increases only if the new term improves the model more than would be expected by chance. f. Predict the sales price of a 1134-square-foot home with a lot size of 15,400 square feet and 2 bedrooms. Selling Price =-24. 888+0. 02323*1134+11. 2589*15400+15. 2356*2=173419 8 PART III SPECIFIC KNOWLEDGE SHORT-ANSWER QUESTIONS. Problem 7 Define Autocorrelation in the following terms: a. In what type of regression is it likely to occur? Regressions involving time series data . What is bad about autocorrelation in a regression? The standard error of the estimat es will high. c. What method is used to determine if it exists? (Think of statistical test to be used) Durbin Watson Statistic is used determine auto correlation in a regression. d. If found in a regression how is it eliminated? Appropriate transformations can be adopted to eliminate auto correlation. Problem 8 Define Multicollinearity in the following terms: a) In what type of regression is it likely to occur? Multicollinearity occurs in multiple regressions when two or more independent variables are highly correlated. ) Why is multicollinearity in a regression a difficulty to be resolved? Multicollinearity in Regression Models is an unacceptably high level of intercorrelation among the independents, such that the effects of the independents cannot be separated. Under multicollinearity, estimates are unbiased but assessments of the relative strength of the explanatory variables and their joint effect are unreliable. c) How can multicollinearity be determined in a regression? Multic ollinearity refers to excessive correlation of the predictor variables. When correlation is excessive (some use the rule of thumb of r > 0. 90), tandard errors of the b and beta coefficients become large, making it difficult or impossible to assess the relative importance of the predictor variables. The measures Tolerance and VIF are commonly used to measure multicollinearity. Tolerance is 1 – R2 for the regression of that independent variable on all the other independents, ignoring the dependent. There will be as many tolerance coefficients as there are independents. The higher the inter-correlation of the independents, the more the tolerance will approach zero. As a rule of thumb, if tolerance is less than . 20, a problem with multicollinearity is indicated.When tolerance is close to 0 there is high multicollinearity of that variable with other independents and the b and beta coefficients will be unstable. The more the multicollinearity, the lower the tolerance, the more th e standard error of the regression coefficients. d) If multicollinearity is found in a regression, how is it eliminated? Multicollinearity occurs because two (or more) variables are related – they measure essentially the same thing. If one of the variables doesn’t seem logically essential to your model, removing it may reduce or eliminate multicollinearity.

Social responsibility of businesses Essay Example | Topics and Well Written Essays - 1000 words

Social responsibility of businesses - Essay Example If they are to be civil servants taxing and spending for "social" objectives, then they must be elected. Conversely, when the individual proprietor exercises his "social responsibility," he is spending his own money and is justifiable. So the social responsibility of businesses is to increase its profits ethically in free and open competition (Milton, 1970). Stakeholders include owners (who have a financial stake with expectation of returns, employees with their livelihood at stake expectant of security, benefits and meaningful work), suppliers (have their survival at stake and determine the firm's success, customers (exchange resources for products to profit the firm and benefit from the products), the local community (grants the right to firms to construct and returned with good facilities) and management. Management's stake is akin to the employees with the duty to safeguard the welfare of corporation, by resolving conflicts among conflicting stakeholders and balance their interes ts based on a doctrine of fairness (Ed, 1994). The disagreement lies in management. For Ed, the management still fulfils its role as long as the interests of the stakeholders are met with equality (Ed, 1994). As for Milton, once the manager is not an elected civil servant who taxes and spends the proceeds for "social purposes", he seizes to be manager (Milton, 1970). In his article, he explained that w... In his article, he explained that we act as consumers to get what we want for ourselves and we act as citizens to achieve what we think is right or best for the community (Sagoff). This implies that when we will think of national goals, they will go beyond our self-mere interest. Based on this distinction there will be a significant ethical difference between risk that is taken by the consumers (who chooses smoking) and risk that is imposed on them as citizens (subjected to the radioactive waste). Therefore in view of the cost benefit analysis, which sides the consumers, is not an adequate solution to address environmental concerns as it does not allow us "to have power to act as a nation", because we are not "able to acton a public philosophy, conviction, or faith" (Sagoff). 3.2 Name three steps along the roadmap Lovins, Lovins and Hawkin describe. The first step is to dramatically increase the productivity of natural resources by reducing the wasteful and destructive flow of resources from depletion to population through fundamental changes in both production design and technology. The second step is the shift to biologically inspired models where systems can be designed to eliminate the use of toxic materials, which can hamper nature's ability to reprocess materials (closed-loop manufacturing). The third step would be a move to a solutions-based business model where the new relationship from this model of delivering value as a flow of service will align the interest of providers and customers in ways that reward them for implementing the first two steps. 4.1 What are Reich's arguments against corporate social responsibility Make a list, with one sentence summarizing each. "1. Why the interest" describes the increase of interest in "corporate social

Sickle cell anemia Research Paper Example | Topics and Well Written Essays - 1000 words

Sickle cell anemia - Research Paper Example This paper briefly analyses various characteristics of Sickle cell anemia. DESCRIPTIVE STATISTICS Anemia is a condition in which the number of red cells in blood decreases beyond certain limits. It can occur because of lack of hemoglobin and defective functioning of hemoglobin. Sickle cells contain sickle hemoglobin or hemoglobin S which is causing Sickle cell anemia. The changes in the shape of red blood cells are referred as sickling in medical terms. Sickle shaped means the shaping of red blood cells in the form of a crescent. Normally blood cells are disc shaped and therefore it can move quickly through the blood. However, when it attains the shape of a crescent, mobility of these cells would be decreased. (Kids health: Sickle Cell Anemia, 2011) Sickling can affect the normal functioning of the cells in different ways. It can reduce the flexibility of the cells and thereby various complications can occur to the patient. Life expectancy of the Sickle cell anemia patients has found to be comparatively lower to that of the normal people. Sickle cell anemia is usually appearing at the childhood itself. In areas where malaria is common, Sickle cell anemia found to be more common. In other words, a connection between Sickle cell anemia and malaria cannot be ruled out. ... It should be noted that normal life span of red blood cells is about 120 days. If red cells die within 10 to 20 days from its production, it is evident that the normal number of red cells cannot be sustained in blood. It is difficult for bone marrow to supply enough red cells based on the demand created by the untimely death of red cells. CLINICAL MANIFESTATIONS If both parents have the sickle cell trait, the chance that a child will have sickle cell disease is 25%. If one parent is carrying the trait and the other actually has disease, the odds increase to 50% that their child will inherit the disease (Sickle cell anemia: patient education, 2011) Sickle cell anemia normally occurs when a child gets two sickle cell genes from his parents. If the child gets the defective gene or hemoglobin from one parent and normal hemoglobin from the other parent, he may develop sickle cell trait. However, such people may not show the symptoms of this disease. Symptoms of Sickle cell anemia may not appear until a child becomes four months old. Unusual pain lasting from hours to days is the major symptom of Sickle cell anemia. In some cases, the pain might be extended for many years. Pain can affect the entire body. â€Å"Abdominal pain, Bone pain, Breathlessness, Delayed growth and puberty, Fatigue, Fever, Paleness, Rapid heart rate, Ulcers on the lower legs, jaundice, Chest pain, Excessive thirst, Frequent urination, Painful and prolonged erection, Poor eyesight, Strokes, Skin ulcers† (Sickle cell anemia, 2011) etc are the major symptoms of Sickle cell anemia. DIAGNOSIS CRITERIA â€Å"Complete blood count (CBC) test, Hemoglobin electrophoresis, Sickle cell test† (Sickle cell anemia, 2011) etc are some of the