Chapter 10.5, Problem 31SE

From a telephone log, an executive finds that 36 of 128 incoming telephone calls last week lasted at least 5 minutes. She vows to make an effort to reduce the length of time spent on calls. The phone log for the next week shows that 14 of 96 incoming calls lasted at least 5 minutes. (a) At α = .05, has the proportion of 5-minute phone calls declined by more than 10 percent? (b) Find the p-value.