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Sep27 - Administering Surveys Questionnaires vs Interviews...

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9/27/10 1 Questionnaires vs. Interviews Administering Surveys Questionnaires Inexpensive Difficult to motivate respondents Neither respondent nor researcher can seek clarification Response rate can be low Response bias: some individuals chosen to respond to a survey systematically fail to do so Interviews More expensive to administer Higher response rate, less chance of response bias Respondent can ask questions, interviewer can ask for clarification of responses Possibility of interviewer bias, when the interviewer inadvertently biases responses …by reacting to responses …by guiding responses Samples vs. Populations Statistics vs. Parameters Sampling – selecting a sample to draw conclusions about the population Confidence interval Ex: There is a 95% probability that the true population mean falls within a given range “46% of voters chose Candidate X. The 95% confidence interval is ±5%.” = there is a 95% probability that the true population value is between 41% and 51%.
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