A researcher conducted a randomized control trial to study the effect of a new d

Question

A researcher conducted a randomized control trial to study the effect of a new drug for hypertension. The researcher recruited some patients suffering from hypertension in his study and randomly assigned them into either the new-drug group or the placebo group. At the end of the study, the researcher compared the mean blood pressure of the two groups. The investigated data of this study are recorded in the table. General Information [2 points ] Blood Pressure 70 79 69 95 91 85 89 75 78 81 90 95 67 What is the sample size? New Drug What is the study design? 89 92 97 82 79 85 Placebo What is the importance of the placebo group? How many patients were recruited in the new-drug group?

Explanation / Answer

(a) sample size = n = 20

(b) study design:

Specific plan for conducting the study, which allows the investigator to translate the conceptual hypothesis into an operational one:

Comparing the mean blood pressure of the two groups: new-drug group and placebo group so that effect of new drug on hypertension is studied.

(c) Importance of the placebo group:

The placebo group enables the researcher to pinpoint precisely whether the new drug has effect on hypertension: If the mean blood pressure on the two groups are found to be not significantly different, it enables the researcher to conclude that the new drug has no effect on hypertension. If the mean blood pressure on the two groups are found to be significantly different, it enables the researcher to conclude that the new drug has effect on hypertension.

(d) Number of patients recruited in the new- drug group: 11

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