Chapter 9.1, Problem 22E

In Exercises 9.15–9.22, hypothesis tests are proposed. For each hypothesis test,

1. a.      determine the null hypothesis.
2. b.      determine the alternative hypothesis.
3. c.       classify the hypothesis test as two tailed, left tailed, or right tailed.

9.22 Teacher Salaries. Data on salaries in the public school system are published annually in Ranking of the States and Estimates of School Statistics by the National Education Association. The mean annual salary of (public) classroom teachers is $55.4 thousand. A hypothesis test is to be performed to decide whether the mean annual salary of classroom teachers in Ohio is greater than the national mean.