The Texas transportation institute 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 angels where drivers wasted an average of 90 hours per year. Assume sample data for six drivers in each of the following cities show the following number of hour's waster per year sitting in traffic.
|
Denver:
|
70
|
62
|
71
|
58
|
57
|
66
|
|
Miami:
|
66
|
70
|
55
|
65
|
56
|
66
|
|
San Francisco:
|
65
|
62
|
74
|
69
|
63
|
75
|
a) Compute the sample mean hours wasted per year for each of these urban areas.
b) Using α = .05 test for significance differences among the population mean wasted time for theses three urban areas. What is the p-value? What is your conclusion?