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standard deviation of the mileage

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The manufacture of theX-15 steel belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles.

The standard deviation of the mileage is 5,000 miles. The Crosset Truck Company bought 48 tires and found that the mean mileage for their trucks is 50,500 miles.

Is Crosset's experience different from that claimed by the manufacturer at the .05 significance level?

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Solution Summary

The solution determines if Crosset`s experience different from that claimed by the manufacturer at the 0.05 significance level.

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