Introductory Statistics (2nd Edition)
Introductory Statistics (2nd Edition)
2nd Edition
ISBN: 9780321978271
Author: Robert Gould, Colleen N. Ryan
Publisher: PEARSON
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Chapter 12, Problem 4SE
To determine

Identify whether the given study is a controlled experiment or an observational study and check whether or not it can be concluded that supplements cause breast cancer.

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Do sports drinks help prevent cramps in endurance sports? At the end of a marathon, officials will ask runners if they drank water or a sports drink during the race, along with whether or not they suffered any cramps. Is this an observational study or experiment?
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Introductory Statistics (2nd Edition)

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