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How many participants would be required to ensure that a 95% confidence interval for the mean difference in the number of drinks is within 5

How many participants would be required to ensure that a 95% confidence interval for the
mean difference in the number of drinks is within 5 drinks of the true mean difference?
Assume that the standard deviation of the difference in the mean number of drinks is 5.1
and that 15% of the participatns will drop outover the course of follow-up.

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