In a study to examine the effectiveness of a new acne cream, participants were assigned to one of two groups: those who would be asked to use the cream for three months and those who would not use any treatment. Participants would be asked to keep a journal rating how bad they think their acne is on a scale of 1–10 each week.
What are the well-designed aspects of this study?
What are the limitations?
How would you improve the design of this study to address these limitations?
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