Leon mailed out 2,000 copies of a questionnaire aimed at assessing people's feelings toward a proposed tax increase. He received 200 completed responses. In drawing conclusions about his findings, he should be most concerned about:
A) interviewer bias.
B) observer bias.
C) social desirability bias.
D) nonresponse bias.

Question

Quizplus · Accepted Answer

Nonresponse bias is a significant concern in this scenario because a large portion of the questionnaires were not returned (only 200 out of 2,000), which may mean that the opinions of those who did not respond could be systematically different from those who did, potentially skewing the results.

Leon Mailed Out 2,000 Copies of a Questionnaire Aimed at Assessing