Question: Subjects were randomly divided into two groups. One group was permitted 4 hours of sleep each night for one week. The other group was allowed

Subjects were randomly divided into two groups. One group was permitted 4 hours of sleep each night for one week. The other group was allowed to sleep at least 8 hours each night for one week. The blood pressures of both groups were taken at the end of the week and compared.

For Exercises determine whether an observational study or an experimental study was used.

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