Mathematics, 11.02.2021 09:40 kingyogii

-) People who walked for half an hour three times a week and people who sat quietly reading a book for half an hour three
times a week participated in a one year study. At the end of the year, the change in each participant's blood pressure was
measured. The changes were compared for the two groups.
This is an observational study rather than a randomized experiment because

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-) People who walked for half an hour three times a week and people who sat quietly reading a book...