For each of the following statements, formulate appropriate null and alternative hypotheses. Indicate whether the appropriate test will be one-tail or two-tail, then sketch a diagram that shows the approximate location of the "rejection" region(s) for the test.
a. "The average college student spends no more than $300 per semester at the university's bookstore."
b. "The average adult drinks 1.5 cups of coffee per day."
c. "The average SAT score for entering freshmen is atleast 1200."
d. "The average employee put in 3.5 hours of overtime last week."