SOLUTION: a doctor at a local hospital is interested in estimating the birth weight of infants.How large of a sample must she select if she desire to be 98% confident that the mean is within

Question 865552: a doctor at a local hospital is interested in estimating the birth weight of infants.How large of a sample must she select if she desire to be 98% confident that the mean is within 3 ounces of the sample mean? The standard deviation of the birth weights is known to be 9 ounces.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi

3 = 

n = (2.3263*9/3)^2 = 48.7 

n ≥  49 



CI	z -value

90%	z =1.645

92%	z = 1.751

95%	z = 1.96

98%	z = 2.326

99%	z = 2.576

 

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