Section 1.1 Homework

7.  Which of the following is NOT a voluntary response​ sample?

Choose the correct answer below.

1. 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.
2. Quiz scores from a college level statistics course are analyzed to determine student progress.
3. A survey is taken at a mall by asking passersby if they will fill out the survey.
4. A radio station asks for​ call-in responses to a question concerning city recycling.