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    Hypothesis testing: X-15 steel-belted radial truck tire

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    The manufacturer of the X-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 59,500 miles. Is Crosset's experience different from that
    claimed by the manufacturer at the .05 significance level?

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    Solution Preview

    Please see the attached file.

    Null hypothesis:H0: µ=60,000 miles
    Alternative hypothesis: Ha: µ not = 60,000 miles
    We need to perform the two-tailed z test, the critical values are ...

    Solution Summary

    This posting contains solution to following hypothesis testing question.