The Wechsler IQ test is designed so that the mean is

100

and the standard deviation is

15

for the adult population. Find the minimum sample size necessary to estimate the mean IQ score of California residents (adults) if you want to be 95% confident that the sample mean is within

3

IQ points of the true mean.

Question content area bottom

Part 1

The required sample size is

enter your response here.

(Round up to the nearest whole number.)