1. Suppose repair time for a certain model of truck is approximately normal with unknown mean, but variance 250 minutes. Conduct a hypothesis test using a = 0.01 to test that the mean repair time is actually 700 minutes. Summary statistics of the sample data is given below. n = 25 = 709.6 2. Using the same setup as problem 1, but now we do not know the variance, conduct the hypothesis test again. Suppose we found that s = 265.8.