Question: What is the main difference between an observational study and an experiment? A. Experiments must take place in a laboratory or a place where the

What is the main difference between an observational study and an experiment? 

A. Experiments must take place in a laboratory or a place where the responses of the experimental units can be tightly controlled. 

B. In experiments, the levels of the explanatory variable are imposed by the researcher rather than being observed naturally. 

C. Only in experiments can a research hypothesis be properly tested. 

D. All the above are true in experiments.

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