14. A tire manufacturer claims that their tires have a mean lifetime equal to 75,000 miles (assuming regular rotations of the tires are performed).  A sample of 36 of their tires are randomly selected and tested.  They have a mean lifetime 73,125 miles with a standard deviation of 4,800 miles.  Use the p-value method of hypothesis testing to test the company’s claim at the 2% significance level.