An analyst might want to determine whether there is a difference in the cost per mile of airfares in the United States between 1979 and 2009 for various cities. The data in Table represent the costs per mile of airline tickets for a sample of 17 cities for both 1979 and 2009.

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An analyst might want to determine whether there is a difference in the cost per mile of airfares in the United States between 1979 and 2009 for various cities. The data in Table represent the costs per mile of airline tickets for a sample of 17 cities for both 1979 and 2009.

2009
City
10
City
1979
1979
2009
1
20.3
22.8
20.3
20.9
2
19.5
12.7
11
19.2
22.6
3
18.6
14.1
12
19.5
16.9
4
20.9
16.1
13
18.7
20.6
5
19.9
25.2
14
17.7
18.5
18.6
20.2
15
21.6
23.4
7
19.6
14.9
16
22.4
21.3
8
23.2
21.3
17
20.8
17.4
9
21.8
18.7
Transcribed Image Text:2009 City 10 City 1979 1979 2009 1 20.3 22.8 20.3 20.9 2 19.5 12.7 11 19.2 22.6 3 18.6 14.1 12 19.5 16.9 4 20.9 16.1 13 18.7 20.6 5 19.9 25.2 14 17.7 18.5 18.6 20.2 15 21.6 23.4 7 19.6 14.9 16 22.4 21.3 8 23.2 21.3 17 20.8 17.4 9 21.8 18.7
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