Three rival professors teaching English I all claim the honor of having the best students. To settle the issue, eight students are randomly drawn from each class and are given the same exam, which is graded by a neutral professor who does not know from which class the students came.

The data follow:

Professor A: 82 71 56 58 63 64 62 53 Professor B: 55 88 85 83 71 70 68 72 Professor C: 65 54 66 68 72 78 65 73 Run the appropriate test and draw the appropriate conclusions.