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Lecture 4

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SOC 205
Owen Gallupe

Week 4 10/2/2013 11:57:00 AM Chapter 12  Sampling: selection of individuals & other units of analysis for research.  Representative sample – sample that is similar to the population in all important areas. o Can’t ask people in your class – would exclude a majority of individuals. i.e. people from different faculties. o Chance of bias – possible participants dependent on non- universal criteria. Would not represent the population from which it was selected. o Steps to minimize bias:  Use random method to pick the sample.  Each element has the same chance of being selected – number from a lottery cage.  Have adequate sampling frame/list of potential subjects.  Do not exclude certain cases as it will not represent the population.  Have everyone respond.  When people do not respond, it does not represent the population as those who did respond might differ from those who did not.  Structured interviews: all respondents are asked exactly the same questions in the same order with the aid of a formal interview schedule.  Questionnaire: written questions that the respondent completes w/o the aid of an interviewer.  Sampling error cannot be eliminated entirely.  Probability sample: sample selected at random in which each unit in the population has a known probability of being selected.  Minimizes sample error 
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