The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of each brand at random to the two rear wheels of eight cars and runs the cars until the tires wear out. The data (in kilometers) follow. Find a 99% confidence interval on the difference in mean life. Car Brand 1 Brand 2 34,318 42,280 1 36,925 45,300 36,240 35,500 4 32,100 31,950 37,210 38,015 6. 48,360 47,800 38,200 37,810 33,500 33,215

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