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A1 A Tires claims that its tires last longer than tires manufactured by its main competitor, WZ Tires. A consumer group studied the lifespans of
A1 A Tires claims that its tires last longer than tires manufactured by its main competitor, WZ Tires. A consumer group studied the lifespans of tires manufactured by each company. The accompanying table gives the lifespans ofa random sample of 10 tires from each manufacturer, in thousands of miles. Assume that the population variances of the lifespan for tires manufactured by A1A Tires and by WZ Tires are not equal, and assume that the lifespans of both com panies' tires are normally distributed. Let A1ATires be the rst sample. and let W2 Tires be the second sample. At the 0.05 level of significance, is there evidence that A'l A Tiresr claim is true? Perform the test using a Tl83, TI83 Plus, or TI84 calculator. Find the test statistic, rounded to two decimal places, and the p-value, rounded to three decimal places
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