Question

which of the following is not a voluntary response sample?
choose the correct answer below.
a. a radio station asks for call - in responses to a question concerning city recycling
b. quiz scores from a college level statistics course are analyzed to determine student progress.
c. 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.
d. a survey is taken at a mall by asking passersby if they will fill out the survey

Explanation:

A voluntary - response sample consists of people who choose themselves by responding to a general appeal. In option A, radio listeners choose to call in. In option C, patients choose to fill out and mail back the questionnaire. In option D, passers - by choose to fill out the survey. However, in option B, quiz scores are part of a course assessment and students do not have the option to volunteer or not for the quiz taking for the purpose of determining student progress.

Answer:

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