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 mean is within 3 ounces of the sample mean? The standard deviation of the birth weghts is known to be 8ounces. Assume the populattion is normally distributed. ( Round your answer up to the nearest whole number)

Question

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 mean is within 3 ounces of the sample​ mean? The standard deviation of the birth weghts is known to be 8ounces. Assume the populattion is normally distributed.​ ( Round your answer up to the nearest whole​ number)