In each case determine whether the study in question is a

Reference no: EM13609367

In each case, determine whether the study in question is a controlled experiment or an observational study; justify your answer.

(a) Studying whether drivers who pass through a certain intersection signal their turns at that intersection.

(b) Tracking the blood pressure of patients in two groups; the members of one have been given a certain drug by the investigators, and the members of the other have not.

Reference no: EM13609367

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