Brake wear: For a sample of 9 automobiles, the mileage (in 1000 s of miles) at which the original front brake pads were worn to 11 % of their original thickness was measured, as was the mileage at which the original rear brake pads were worn to 11 % of their original thickness. The results were as follows: Car Rear Front 40.5 32.6 35.3 27.2 45.7 35.1 47.4 35.5 38.5 30.5 51.1 41.2 50.5 39.8 46.0 34.4 47.3 36.3 Send data to Excel Part: 0 / 2 Part 1 of 2 (a) Construct a 90% confidence interval for the difference in mean lifetime between the front and rear brake pads. Let d represent the mileage of the rear pads minus the mileage of the front ones. Round the answers to at least two decimal places. A 90 % confidence that the mean difference in lifetime between front and rear brake pads isPart 2 of 2 (b) An automotive engineer claims that the mean lifetime for rear brake pads is more than 10,000 miles more than the mean lifetime for front brake pads. Does the confidence interval contradict this claim? Because the confidence interval (Choose one) values above 10 (in 1000 s of miles), it (Choose one) the claim that the mean lifetime for rear brake pads is more than 10,000 miles more than the mean lifetime for front brake pads