Jump to level 1 An auto maker is interested in information about how long transmissions last. A sample of transmissions are run constantly and the number of miles before the transmission fails is recorded. The auto maker claims that the transmissions can run constantly for over 150,000 miles before failure. The results of the sample are given below. Miles {1000: of miles) Mean 150.? Variance 4-661 What is the level of significance? EX: 0.12 Observations 46 :fwmmmd Mean 1:: What is the null hypothesis H0? tStat 2.135 _ P(T