Question: This is also Exercise 1.12. A proposed study design is to leave 100 questionnaires by the checkout line in a student cafeteria. The questionnaire can
This is also Exercise 1.12. A proposed study design is to leave 100 questionnaires by the checkout line in a student cafeteria. The questionnaire can be picked up by any student and returned to the cashier. Explain why this volunteer sample is a poor study design.
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