Drive safely: How often does the average driver have an accident? The Allstate Insurance Company determined the average number of years between accidents for drivers in a large number of U.S. cities. Following are the results for 32 cities east of the Mississippi River and 32 cities west of the Mississippi River. East 10.2 9.5 11.2 11.4 9.8 10.0 11.6 10.7 9.5 9.0 7.2 11.5 7.7 9.0 8.9 8.4 6.8 5.3 8.0 8.8 9.0 10.0 9.7 11.6 7.9 9.9 10.5 11.9 10.9 8.6 6.7 9.6 West 9.5 7.9 13.4 12.6 9.7 8.2 14.0 7.1 10.2 9.4 10.8 9.5 7.5 9.1 8.4 7.6 7.4 7.7 7.1 11.9 10.2 11.9 7.7 7.0 10.0 8.1 11.5 8.4 9.6 9.5 9.9 11.5 Can you conclude that the mean time between accidents is greater for western cities than for eastern cities? Use the α = 0.05 level of significance
20. Drive safely: How often does the average driver have an accident? The Allstate Insurance Company determined the average number of years between accidents for drivers in a large number of U.S. cities. Following are the results for 32 cities east of the Mississippi River and 32 cities west of the Mississippi River.
|
East |
|||||||
|---|---|---|---|---|---|---|---|
|
10.2 |
9.5 |
11.2 |
11.4 |
9.8 |
10.0 |
11.6 |
10.7 |
|
9.5 |
9.0 |
7.2 |
11.5 |
7.7 |
9.0 |
8.9 |
8.4 |
|
6.8 |
5.3 |
8.0 |
8.8 |
9.0 |
10.0 |
9.7 |
11.6 |
|
7.9 |
9.9 |
10.5 |
11.9 |
10.9 |
8.6 |
6.7 |
9.6 |
|
West |
|||||||
|---|---|---|---|---|---|---|---|
|
9.5 |
7.9 |
13.4 |
12.6 |
9.7 |
8.2 |
14.0 |
7.1 |
|
10.2 |
9.4 |
10.8 |
9.5 |
7.5 |
9.1 |
8.4 |
7.6 |
|
7.4 |
7.7 |
7.1 |
11.9 |
10.2 |
11.9 |
7.7 |
7.0 |
|
10.0 |
8.1 |
11.5 |
8.4 |
9.6 |
9.5 |
9.9 |
11.5 |
Can you conclude that the mean time between accidents is greater for western cities than for eastern cities? Use the α = 0.05 level of significance
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