3.The wearing qualities of two types of automobile tires were compared by road testing samples of n1 = n2 = 100 tires for each type. The number of miles until wear out was defined as a specific amount of tire wear. The test results are given below Tire1: Mean(x1 bar)=26,400 miles , s1 2 = 1,440,000 Tire 2: Mean(x2 bar)=25,100 miles , s2 2 = 1,960,000 miles Estimate μ1 − μ2, the difference In mean miles to wear out, using a 99% confidence interval. Is there a difference in the average wearing quality for the two types of tires?

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