Question:medium

To test whether two different skin creams A and B have different effects on the human body, $n$ persons were enrolled in a clinical trial. Then cream A was applied to one arm and cream B to the other arm of each of the $n$ randomly selected persons. What type of design is this?

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Whenever you see a "before and after" study or a "left arm vs. right arm" study, it is almost always a Randomized Block Design because the subject acts as their own control (block).

Updated On: Jun 6, 2026

Completely Randomized Design
Randomized Block Design
Latin Square Design
Balanced Incomplete Design

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The Correct Option is B

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To test whether two different skin creams A and B have different effects on the human body, $n$ persons were enrolled in a clinical trial. Then cream A was applied to one arm and cream B to the other arm of each of the $n$ randomly selected persons. What type of design is this?

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The Correct Option is B

Solution and Explanation

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