Question: Problem 7.38 To determine the difference, if any, between two brands of radial tires, 12 tires of each brand are tested and the following mean

Problem 7.38 To determine the difference, if any, between two brands of radial tires, 12 tires of each brand are tested and the following mean lifetimes and sample standard deviations for each of the two brands were obtained: x1 = 38500 and s1 = 3100 x2 = 41000 and s2 = 3500 Assume the tire lifetimes are normally distributed. Find a 95% confidence interval for the difference in the mean lifetimes.

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