What is the main difference between an observational study and an experiment? A. Experiments must take place

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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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Introduction To Statistical Investigations

ISBN: 9781119683452

2nd Edition

Authors: Beth L.Chance, George W.Cobb, Allan J.Rossman Nathan Tintle, Todd Swanson Soma Roy

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Question Posted: Feb 27, 2023 07:12 AM

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What is the main difference between an observational study and an experiment? A. Experiments must take place

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B In experiments the lev...View the full answer

Introduction To Statistical Investigations

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