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In a randomized controlled trial comparing two weight-loss programs (A and B), researchers randomly assign 200 overweight adults to one of the two programs. Program A has 50 dropouts out of 100 participants; Program B has 30 dropouts out of 100. Why is this attrition pattern problematic for drawing causal conclusions?
In a randomized controlled trial comparing two weight-loss programs (A and B), researchers randomly assign 200 overweight adults to one of the two programs. Program A has 50 dropouts out of 100 participants; Program B has 30 dropouts out of 100. Why is this attrition pattern problematic for drawing causal conclusions?