Mean IQ of Attorneys See the preceding exercise, in which we can assume that σ = 15 for the IQ scores. Attorneys are a group with IQ scores that vary less than the IQ scores of the general population....

Mean IQ of Attorneys See the preceding exercise, in which we can assume that σ = 15 for the IQ scores. Attorneys are a group with IQ scores that vary less than the IQ scores of the general population. Find the sample size needed to estimate the mean IQ of attorneys, given that we want 98% confidence that the sample mean is within 3 IQ points of the population mean. Does the sample size appear to be practical?