An evaluator wishes to make a statement about the emotional maturity of the freshman population at your school, so she decides to sample the population and administer an emotional maturity test. Putting aside any concerns about the validity of the test used, and considering sampling techniques only, how many students should she sample in order to be 95% confident that her estimate of freshman emotional maturity will be within 6 units of the true mean? (The test publishers indicate the population variance is 100 units.)