SOLUTION: 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 99% confident that the true mean is wit

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Question 930625: 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 99% confident that the true mean is within 2 ounces of the sample mean? The standard deviation of the birth w eights is known to be 7 ounces.
A)10
B)81
C)9
D)82

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
n = ( 2.576(7)/2)^2 = 81.288 (Always Up to next Integer)
Sample size: 82