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In one study of chocolate on blood flow, 75 patients who acknowledgedbeing long time chocolate...

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In one study of chocolate on blood flow, 75 patients who acknowledgedbeing long time chocolate eaters had their blood flow levels comparedwith those of 75 people who did not eat chocolate.In a second study, 25 subjects were randomly chosen to receive chocolateand 25 were chosen to receive a placebo.Which of the following is true?Both studies were observational studies.The first study was an experiment, while the second one was an observational study.Both studies were experiments.The first study was an observational study, while the second one was an experiment.

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