9. A shipping firm suspects that the mean life of a certain brand of tire used by its trucks is less than 29,000 miles. To check the claim, the firm randomly selects and tests 17 of these tires and gets a mean lifetime of 27500 miles with a standard deviation of 1100 miles. At a = 0.1, test the shipping firm's claim. Round the test statistic to the nearest hundredth. Write the null and alternate hypothesis. (conclude your result with P-value and critical value approach, both)

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