Considerations When Sampling

Question 1 • NC-Math 4 CR

The sample for a study exhibits undercoverage 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 participate in the study.

The subjects in the study are not representative of the population, because some members of the population refused to take part in the study.

Explanation

Undercoverage bias occurs when part of the population is left out or unable to be included in the sample. This can make the sample unrepresentative of the population. Choice C describes this; choice D describes nonresponse bias, which occurs when selected people refuse to participate.

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