Question: Which technique for gathering data (observational study or experiment) was used in the following studies? [1.5] a) Students were randomly divided into two groups. One

Which technique for gathering data (observational study or experiment) was used in the following studies? [1.5] a) Students were randomly divided into two groups. One group was permitted 4 hours of sleep each night for 9 days. The other group was allowed to sleep at least 8 hours each night for 9 days. The blood pressures of both groups were taken at the end of the week and compared

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