A group of clinical physicians is performing tests on patients to determine the effectiveness of a new antihypertensive drug. Patients with high blood pressure were randomly chosen and then randomly assigned to either the control group (which received a well-established antihypertensive) or the treatment group (which received the new drug). The doctors noted the percentage of patients whose blood pressure was reduced to a normal level within 1 year. At the 0.01 level of signifi cance, test appropriate hypotheses to determine whether the new drug is signifi cantly more effective than the older drug in reducing high blood pressure.

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