Q. 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.
Denver Miami San Francisco
70 66 65
62 70 62
71 55 74
58 65 69
57 56 63
60 66 75
a. Compute the sample mean hours wasted per year for each of these urban areas.
b. Using a = .05, test for significance differences among the population mean wasted time for these three urban areas. What is the p-value? What is your conclusion.