The director of admissions of a large university has recently surveyed a random sample of 28 first-year students to determine whether the mean age of the first-year students is over 18. The appropriate hypotheses are H0: μ = 18, Ha: μ > 18. If he concludes that the mean age is over 18 when it is not, and if he concludes that the mean age is not over 18 when it is, what types of errors have been made?
Type II; Type II
Type II; Type I
Type I; Type II
Type I; Type I