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Steel-belted radial truck tires claims

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Reference no: EM132351328

The manufacture of X-15 steel-belted radial truck tires claims that the mean mileage the tire can be driven before the tread wears out is 70,000 miles. Assume the mileage wear follows the normal distribution and the standard deviation of the distribution is 4,000 miles. Crossest Truck Company bought 49 tires and found the mean mileage for its trucks is 72,000 miles. Is Crosser"s experience different from that claimed by the manufacturer is the .01 significance level?

Reference no: EM132351328

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