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QUESTION
A medical statistician wants to estimate the average weight loss of people who are on a new diet plan.
A medical statistician wants to estimate the average weight loss of people who are on a new diet plan. In a preliminary study, he guesses that the standard deviation of the population of weight loss is about 9 pounds. How large a sample should he take to estimate the mean weight loss to within 3 pounds, with 91% confidence?
