Find the Necessary Sample Size

Multiple Choice

Find the necessary sample size.
-Weights of women in one age group are normally distributed with a standard deviation Ϭ of 14 lb. A researcher wishes to estimate the mean weight of all women in this age group. Find how large a Sample must be drawn in order to be 90 percent confident that the sample mean will not differ from The population mean by more than 3.0 lb.

A) 57
B) 60
C) 84
D) 59