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 |
40.5 |
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 |
Let μXμX represent the population mean for rear brake pads and let μYμY represent the population mean for front brake pads. Find a 95% confidence interval for the difference μD=μX−μYμD=μX−μY. Round the answers to three decimal places.
The 95% confidence interval for the difference in mean is (_,_ ).
The statistical software output for this problem is :
The 95% confidence interval for the difference in mean is : (4.922 , 15.211)
For a sample of nine automobiles, the mileage (in 1000s of miles) at which the original...
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 wom to 10% of their original thickness. The results are given in the following table Front 32.8 26.6 35.6 36.4 29.2 40.9 40.9 34.8 36.6 Rear 39.8 35.2 46.1 46 39.9 51.7 51.6 46.1 47.3 Automobile 2 4 7...
2. 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 32.8 41.2 26.6 35.2 36.6 46.1 36.4 46.0 29.2 39.9 40.9 51.7 40.9 51.6 34.8 46.1 36.6 47.3 7 (a)...
Brake wear: For a sample of 9 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 were as follows: Car Rear 41. 2 36.3 45.8 46.6 39.6 52.3 51.7 46.3 47.4 Front 32.2 27.2 34.7 37.3 30.7 40.5 41.0 33.8 36.8 7 8 Send...