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A doctor at a local hospital is interested in estimating the birth weight of infants. How large (at least) a sample must she select

A doctor at a local hospital is interested in estimating the birth weight of infants. How large (at least) a sample must she select if she desires to be 95% confident that her estimate is within 2 ounces of the true mean? Assume that a sample standard deviation is 7 ounces based on earlier studies. 06 34 O 47 48 05

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