For a sample of nine automobiles, the mileage (in 1000s of miles) at which the o
ID: 2928639 • Letter: F
Question
For a sample of nine automobiles, the mileage (in 1000s of miles) at which the original front brake pads were worn to 10% of their original thickness was measured, as was the mileage at which the original rear brake pads were worn to 10% of their original thickness. The results are given in the following table.
Automobile
Front
Rear
1
32.8
41.5
2
26.6
35.2
3
35.6
46.1
4
36.4
46
5
29.2
39.9
6
40.9
51.7
7
40.9
51.6
8
34.8
46.1
9
36.6
47.3
Automobile
Front
Rear
1
32.8
41.5
2
26.6
35.2
3
35.6
46.1
4
36.4
46
5
29.2
39.9
6
40.9
51.7
7
40.9
51.6
8
34.8
46.1
9
36.6
47.3
Explanation / Answer
The statistical software output for this problem is:
Paired T confidence interval:
D = 1 - 2 : Mean of the difference between Rear and Front
95% confidence interval results:
Hence,
95% confidence interval will be:
(9.430, 10.926)
Difference Mean Std. Err. DF L. Limit U. Limit Rear - Front 10.177778 0.32437024 8 9.4297787 10.925777Related Questions
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