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A trucking firm suspects that the mean life of a certain tire it uses is less than 35,000 miles. To check the claim, the firm

  1. A trucking firm suspects that the mean life of a certain tire it uses is less than 35,000 miles. To check the claim, the firm randomly selects and tests 18 of these tires and gets a mean lifetime of 34,350 miles with standard deviation of 1200 miles. At = 0.05, test the trucking firms claim.

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