The wearing qualities of two types of automobile tires were compared by road-testing samples of n 5n 5100 1 2 tires for each type and recording the number of kilometers until wearout, defined as a specific amount of tire wear. The test results are given in Table 8.4.

Estimate (m 2m ) 1 2, the difference in mean kilometers to wearout, using a 99% confidence interval. Is there a difference in the average wearing quality for the two types of tires?

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Table 8.4 Sample Data Summary for Two Types of Tires = Tire 1 X, 26,400 kilometers s = 1,440,000 Tire 2 X-25,100 kilometers $=1,960,000