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I think this one is experimental, but I could also see it as observational. Help!
20. For each of the studies presented in problem 19, indicate whether the study is an experimental or observational study
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Answer #1

Experimental study is the study in which researcher gives treatment(s) to some or all subjects but in observational study no treatment is given.

In the given scenario researcher give fed warfarin to all the mice so it is an experimental study.

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