CNN and ActMedia provided a television channel that showed news, features, and ads, and was targeted to individuals waiting in grocery checkout lines. The television programs were designed with an eight-minute cycle on the assumption that the population mean time a shopper stands in line at a grocery store checkout is eight minutes. A sample of 120 shoppers at a major grocery store showed a sample mean waiting time of 7.5 minutes with a sample standard deviation of 3.2 minutes.

a. Test Ho: =8. Use a .05 level of significance. Does the population mean waiting time at the grocery store differ from the eight-minute waiting time assumption?

b. What is the p-value for the test?