Understanding Sampling Methods and Bias in Survey Research

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Understanding Sampling Methods and Bias in Survey Research Points Awarded 9.00 Points Missed 1.00 Percentage 90.0% 1. A census differs from a sample survey because A) a sample survey is only done when measuring the units will destroy them. B) a census is only done when measuring the units will destroy them. C) in a sample survey the whole population is measured. D) in a census the whole population is measured. Feedback: A census is designed to measure the entire population while a sample is a subgroup of the population Points Earned: 1.0/1.0 2. When a representative sample is selected but respondents give answers that are different from their true opinions, the problem is called A) lack of accuracy. B) selection bias. C) nonresponse bias. D) response bias. Feedback: Response bias is the result of respondents providing answers that are not necessarily their true opinions but instead are opinions they believe the researcher wants to hear or when respondents are afraid to say their true thoughts Points Earned: 1.0/1.0 3. For a survey of American diets a random sample of 1000 people were contacted. Of the 1000 people, 340 people completed the questionnaire. The results of this study, if applied to all Americans, are questionable because of A) a large margin of error. B) selection bias.
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