Midterm 2 Review.docx

6 Pages
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Department
Sociology and Anthropology
Course Code
SOAN 3120
Professor
Michelle Dumas

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10/31/2013 Chapter 17­Review ­sampling chapter 8 identify the population in a sampling situation recognize bias due to voluntary response samples and other inferior sampling methods; people respond to  random surveys typically because they have a strong opinion about what is being asked use Table B of random digits to select a SRS from a population know different ways of sampling: stratified random sampling (stratify by region) Recognize the presence of under coverage and nonresponse as sources od error in a sample survey Ex­ the survey found that 76% of males and 86% of females in the sample had visited a general practitioner  at least once in the past year. Do you think these estimates are close to the truth about the population; yes  because the sample size is large enough to be accurate  ­experiments chapter 9 recognize whether a study is observational study or an experiment recognize bias due to confounding of explanatory variables with lurking variables in either observational or  experimental studies identify the factors (explanatory), treatments, response variables and individuals or subjects in an  experiment use table B of random digits to carry out the random assignments of subjects to groups in a completely  randomized experiment recognize the double­blind technique and when it should be used Ex­gender, age, education etc. are generally explanatory variables  ­probability chapter 10 probability describes the long­run regularity of random phenomenon understand that the probability of an event is the proportion of times the event occurs in very many  repetitions of random phenomenon. Use the idea of probability as long­run proportion to think about  probability recognize that sampling spaces are all possible outcomes. Know how they are presented use the basic probability rules to detect illegitimate assignments of probability; any probability must be a number between 0 and 1 ( 0 to 100%) the total probability assigned to all possible outcomes must be 1 use basic probability riles to find the probabilities of events that are formed from other events the probability that an event does not occur is 1 minus its probability if two events are disjoint, the probability that one or the other occurs is the sum of their individual  probabilities dijjoint event cannot occur together (I,e, no A AND B) use the notation of random variables to make compact statements about random outcomes, such as P (x  bar 
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