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 of 10 exams. The first instructor's grades have a variance of 33.38. The second instructor's grades have a variance of 88.36. What is the Critical value at 90% confidence level to test the Null Hypothesis H0: σ12 ≥ σ22 against the alternative Ha: σ12 < σ2 2 ?

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