A study was done comparing the effectiveness of exercise vs medication on lowering blood pressure in patients with high blood pressure. Two hundred subjects were randomly assigned to two groups. One group was instructed to exercise according to strict schedule, and the other group was given medication to take. After 3 months, the researchers compared the change in blood pressure between the groups and found that the exercise groups experienced a greater drop in blood pressure on average. a. Is this an observational study or an experimental study? b. Explain why a blind study would be difficult to do in this situation.

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