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a health care professional wishes to estimate the birth weight of infants how large a sample must she select to be 90% confident that the true mean is within 6 ounces of e sample mean. the standard deviation of birth weights is
is known to be 8 ounces

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    birth weight of infants. a health care professional wishes to estimate the birth weights of infants. how large a sample must be obtained if she desires to be 90% confident that the true mean is within 2 ounces of the sample mean? assume sigma=8 ounces

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