Question

which of the following is not a voluntary response sample?
choose the correct answer below
a. quiz scores from a college level statistics course are analyzed to determine student progress
b. a local dentist asks her patients to fill out a questionnaire and mail it back to determine the quality of the care received during an office visit
c. a survey is taken at a mall by asking passerby if they will fill out the survey
d. a radio station asks for call - in responses to a question concerning city recycling

Explanation:

A voluntary - response sample is one where individuals themselves choose to participate. In option A, quiz scores are collected as part of a course evaluation and students do not choose to participate in the sense of a voluntary - response sample. They are required to take the quiz as part of the course. In option B, patients choose whether to fill out and mail back the questionnaire. In option C, passers - by choose whether to fill out the survey. In option D, listeners choose whether to call in with their responses.

Answer:

A. Quiz scores from a college level statistics course are analyzed to determine student progress