33. The Texas Transportation Institute at Texas A&M University conducted a survey to determine the number of hours per year drivers waste sitting in traffic. Of 75 urban areas studied, the most jammed urban area was Los Angeles where drivers wasted an average of 90 hours per year (U.S. News & World Report, October 13, 2003). Other jammed urban areas included Denver, Miami, and San Francisco. Assume sample data for six drivers in each of these cities show the following number of hours wasted per year sitting in traffic.

65 IIT Denver Miami San Francisco 70 66 62 70 71 55 58 65 57 56 66 66 62 74 69 63 75

a. Compute the sample mean hours wasted per year for each of these urban areas.

b. Using a = .05, test for significant differences among the population mean wasted time for these three urban areas. What is the p-value? What is your conclusion?