Two college instructors are interested in whether or not there is any variation in the way they grade math exams. They each grade the same set of20 exams. The first instructor's grades have a variance...

Two college instructors are interested in whether or not there is any variation in the way they grade math exams. They each grade the same set of20 exams. The first instructor's grades have a variance of 85. The second instructor's grades have a variance of 89. Test the claim that the first instructor's variance is smaller. The level of significance is 0.025.