Two accounting professors want to validate that variation in grading procedures of professor 1 and professor 2 is significantly different. To accomplish this, they each graded the same 10 exams with the following results: Mean Grade Standard Deviation Professor 1 79.3 22.4 Professor 2 12.0 82.1 Answer questions 20 to 23 (4 points each): 20. What is H, (alternate hypothesis)? A. o'i = 0 o'#02 B. C. 0> 022 D. 4, #ulz E. None of the above 21. What is the critical value of F at the 0.05 level of significance? A. 5.85 B. 3.72 C. 3.18 D. 4.03 E. 2.98 22. The calculated F ratio is A. 3.484 B. 1.867 C. 4.03 D. 3.18 E. None of the above 23. At the 10% significance level (a = 0.1), what is the decision? A. Reject the null hypothesis and conclude the variances are different. B. Fail to reject the null hypothesis and conclude the variance is different. C. Reject the null hypothesis and conclude the variance is the same. D. Fail to reject the null hypothesis and conclude the variance is the same. E. None of the above