The control group should consists of 50 women who receive an identical looking pill that does not contain the drug.
In an experiment, the control group serves to establish the validity of the experiment. The experimental group is the group that receives the treatment while the control group is the group that did not receive the treatment. In this case, the treatment is the drug Hydrochlorothiazide (HTZ) which reduces blood pressure.
In the control group, 50 women who have high blood pressure could be given an identical looking pill that contains no Hydrochlorothiazide (HTZ) which reduces blood pressure.
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