a manufacturer claims that his tires last at least 40,000 miles. a test on 25 tires reveals that the mean…

a manufacturer claims that his tires last at least 40,000 miles. a test on 25 tires reveals that the mean life of a tire is 39,750 miles, with a standard deviation of 387 miles. test the manufacturers claim at a =.01. what is the t score for the sample? t - score = 461.86 t - score = - 461.86 t - score = 461.88 t - score = - 461.88

Answer