Considerations When Sampling

Question 2 • Math Models A

The results of a study exhibit nonresponse bias. Select the statement that best describes the bias in the study.

Answer

There are not enough subjects in the sample.

Many of the subjects in the study did not answer every question on the survey.

The subjects in the study are not representative of the population, because some members of the population were not able to complete a survey.

The subjects in the study are not representative of the population, because some members of the population could not be contacted or refused to answer the survey.

Explanation

Nonresponse bias occurs when people selected for a survey cannot be reached or refuse to participate, so their views are missing from the results. If those people differ from the respondents, the sample may not represent the population. Choice D describes this; choice B instead refers to respondents leaving individual questions unanswered.

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Probability with Combinations and Permutations