To determine whether Drug Z lowers blood pressure,it is necessary to demonstrate that an experimental group,which has been given Drug Z,will have lower blood pressure than a comparison group,which has been given

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In order to determine whether Drug Z lowers blood pressure, a comparison between the experimental group (which has been given Drug Z) and the comparison group (which has been given a placebo) is necessary. This is because the placebo group acts as a control group, which helps to ensure that any differences observed between the two groups are due to the drug and not just random chance. Option A and B do not serve as controls because they involve giving different dosages of the same drug. Option D is also not a suitable comparison group because it involves not giving any treatment at all.

To Determine Whether Drug Z Lowers Blood Pressure,it Is Necessary