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Each of the following sentences describes the results of a hypothetical experiment or observational study. Explain which was used. If an observational study was used, explain whether an experiment could have been used to study the topic instead.
a) A recent study of more than 4000 women found that smoking was a strong predictor of high-blood pressure.
b) In a two-month study, researchers randomly assigned 500 men and women in Ontario to one of four groups: one received a placebo and the others received 10 mg, 20 mg or 50 mg daily of a new drug to see if this drug helps reduce hypertension. The effect was modest.
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