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A nurse at a local hospital is interested in estimating the birth weight of infants. How...

A nurse at a local hospital is interested in estimating the birth weight of infants. How large a sample must they select if they want to be 99% confident that the true mean is within 2.25 ounces of the sample mean? The standard deviation of the birth weights is known to be 6.02 ounces, and birth weights are approximately normally distributed.

Math   Statistics-And-Probability   
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Hence sample size should be at least 49

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