The ages of a group of 135 randomly selected adult females havea standard deviation of 17.9 years. Assume that the ages of femalestatistics students have less variation than ages of females in thegeneral? population, so let sigmaequals17.9 years for the samplesize calculation. How many female statistics student ages must beobtained in order to estimate the mean age of all femalestatistics? students? Assume that we want 95?% confidence that thesample mean is within? one-half year of the population mean. Doesit seem reasonable to assume that the ages of female statisticsstudents have less variation than ages of females in the general?population?
