Mathematics, 03.04.2020 18:02 dbanks701

A researcher obtained a random sample of 100 smokers and a random sample of 100 nonsmokers. After interviewing all 200 participants in the study, the researcher compared the rate of depression among the smokers with the rate of depression among nonsmokers.
a. Is this a designed experiment or an observational study?
b. Identify the explanatory and response variables.

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A researcher obtained a random sample of 100 smokers and a random sample of 100 nonsmokers. After in...

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