In Exercises 29–32, indicate whether the observational study used is cross-sectional, retrospective, or prospective.Heart Health Study Samples of subjects with and without heart disease were selected, then researchers looked back in time to determine whether they took aspirin on a regular basis.

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Asked Dec 19, 2019
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In Exercises 29–32, indicate whether the observational study used is cross-sectional, retrospective, or prospective.

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

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In cross sectional study the data is collected at one point in time.

In retrospective study the data is collect...

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