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A researcher wants to deterimine if there is any difference between the average wear of two types of automobile tires, 1 and 2 . To

A researcher wants to deterimine if there is any difference between the average wear of two types of automobile tires, 1 and 2. To do so, she chose to "pair" the sample measurements, comparing the wear for the two types of tires on each of 7 automobiles, as shown below.

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