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

Question

Quizplus · Accepted Answer

This is an observational study because the researcher is observing and comparing existing conditions (smoking status and arthritis rates) without attempting to influence or modify the participants' behavior or conditions.

Identify the Following as an Experiment or an Observational Study