Multiple Choice
Identify the following as an experiment or an observational study.
-A researcher obtained a random sample of smokers aged between 60 and 70 and a random sample of nonsmokers aged between 60 and 70. She compared the rates of arthritis for the smokers and for the
Nonsmokers.
A) Experiment
B) Observational study
Correct Answer:
Verified
Correct Answer:
Verified
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