A trucking firm suspects that the mean lifetime of a certain tire it uses is less than 36,000 miles. To check the
claim, the firm randomly selects and tests 54 of these tires and gets a mean lifetime of 35,630 miles with a
population standard deviation of 1200 miles. At α $\alpha =$ .05, test the trucking firmʹs claim.

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The Answer of A trucking firm suspects that the mean lifetime of a certain tire it uses is less than 36,000 miles. To check the
claim, the firm randomly selects and tests 54 of these tires and gets a mean lifetime of 35,630 miles with a
population standard deviation of 1200 miles. At α $\alpha =$ .05, test the trucking firmʹs claim.

A Trucking Firm Suspects That the Mean Lifetime of a Certain