A chemical engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 15 tires and tested them to end-of-life in a road test. The sample mean and standard deviation are i = 60,139.7 and s = 3645.94 kilometers. Find a 99% confidence interval on the mean tire life. Which t-distribution curve applies on the 99% confidence interval? Include your solution. O a. 57,336

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