An IQ test is designed so that the mean is 100 and the standard deviation is 22 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 95% confidence that the sample mean is within 5 IQ points of the true mean. Assume that o = 22 and determine the required sample size.
(a) The required sample size is ___ (Round up to nearest integer)
(b) Is this sample size reasonable?
A. Yes. 75 IQ test scores is a fairly small number
B. No. 75 is a fairly large number
c. No. 75 is a fairly small number
D. Yes. 75 is a fairly large number