Faculty Salaries. Suppose, in Example 10.2 on page 463, you want to decide whether the mean salary of faculty in private institutions is less than the mean salary of faculty in public institutions. State the null and alternative hypotheses for that hypothesis test.

In Exercises 10.25–10.30, hypothesis tests are proposed. For each hypothesis test,

a. identify the variable.

b. identify the two populations.

c. determine the null and alternative hypotheses.

d. classify the hypothesis test as two tailed, left tailed, or right tailed.