Let m1 denote true average tread life for a premium brand of P205/65R15 radial tire, and let

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Let m1 denote true average tread life for a premium brand of P205/65R15 radial tire, and let m2 denote the true average tread life for an economy brand of the same size. Test versus at level

.01, using the following data:

, and .

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