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    Sample Size Calculation

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    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 losses is about 10 pounds. How large of sample should he take to estimate the mean weight loss to within two pounds and with 90% confidence?

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    https://brainmass.com/statistics/sample-size-determination/sample-size-calculation-estimate-mean-weight-loss-274646

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