Indicate whether the observational study used is cross-sectional, retrospective, or prospective. Samples of subjects with and without

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Indicate whether the observational study used is cross-sectional, retrospective, or prospective.

Samples of subjects with and without heart disease were selected, and then researchers looked back in time to determine whether they took aspirin on a regular basis.

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Elementary Statistics

ISBN: 9780136803201

14th Edition

Authors: Mario F. Triola

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