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A nurse at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires

A nurse at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 90% confident that the true mean is within 3 ounces of the samplemean? The population standard deviation of the birth weights is known to be 6 ounces.

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