Question: A student wants to test whether exercise helps people quit smoking. She surveys adults, asking whether they ever smoked, whether they ever quit smoking, and

A student wants to test whether exercise helps people quit smoking. She surveys adults, asking whether they ever smoked, whether they ever quit smoking, and whether they exercise. The student concludes that exercise helps people quit smoking.
a. Describe the problems with the student’s study. Include in your description at least one possible lurking or confounding variable and identify which type it is.
b. Redesign the study so that it is a well-designed experiment.

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