Provide an appropriate response. 22) A shipping firm suspects that the mean life of a certain brand of tire used by its trucks is less than 40,000 miles. To check the claim, the firm randomly selects and tests 18 of these tires and gets a mean lifetime of 39,300 miles with a standard deviation of 1200 miles. At a = 0.05, test the shipping firm's claim. Round the test statistic to the nearest thousandth. 2

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