780 Men Suffering from High Blood Pressure Were Randomly Assigned

Multiple Choice

780 men suffering from high blood pressure were randomly assigned to one of two groups.Over a four-month period,the first group received an experimental drug and the second group received a placebo.A larger decrease in diastolic blood pressure was observed for those who received the drug.The experiment was double-blind.Determine the nature and scope of the conclusion the study can reach.

A) Since the technicians administering the treatment could have been biased,no conclusion can be reached.
B) Since the physicians evaluating the results could have been biased,no conclusion can be reached.
C) For men suffering from high blood pressure,the drug appears to lower diastolic blood pressure.
D) Since there is no random assignment,there is no way to know that the drug caused the decrease in diastolic blood pressure; there could have been confounding variables.
E) For adults suffering from high blood pressure,the drug appears to lower diastolic blood pressure.