In a clinical trial,780 participants suffering from high blood pressure were randomly assigned to one of three groups.Over a one-month period,the first group received a low dosage of an experimental drug,the second group received a high dosage of the drug,and the third group received a placebo.The diastolic blood pressure of each participant was measured at the beginning and at the end of the period and the change in blood pressure was recorded.The biggest decrease in blood pressure was for those who received the low dosage of the drug.

A) Completely randomized over one factor (diastolic blood pressure) ,blocked by experimental drug
B) Completely randomized over one factor (experimental drug)
C) Blocked by experimental drug,blocked by diastolic blood pressure
D) Completely randomized over one factor (experimental drug) ,blocked by diastolic blood pressure
E) Completely randomized over two factors (experimental drug,diastolic blood pressure)

Question

Neliana Cariska · Accepted Answer

Final Answer : B, Explanation :  The trial is described as having participants randomly assigned to one of three groups based on the dosage of the drug or a placebo, indicating it is completely randomized over one factor, which is the experimental drug. There is no mention of blocking by diastolic blood pressure or any other factor.

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