In which of the following cases would sampling bias be LEAST likely?
A) Subjects are volunteers.
B) An equal proportion of subject mortality occurred in experimental and control groups.
C) Subjects who differ in the independent variable are also different in other important respects.
D) Subjects having an important characteristic were not included in the sample.

Question

Quizplus · Accepted Answer

If an equal proportion of subject mortality occurred in both the experimental and control groups, then the remaining subjects are more likely to be representative of the original sample without bias. Choice A involves self-selection bias, where volunteers may differ systematically from non-volunteers. Choice C involves selection bias, where subjects are not randomly chosen and may differ systematically in unmeasured ways. Choice D involves exclusion bias, where subjects with certain characteristics are not included in the sample, leading to an unrepresentative and biased sample.

In Which of the Following Cases Would Sampling Bias Be