Three rival professors teaching English 1 all claim the honor of having the best students.

To settle the issue, eight students are randomly drawn from each class and given the same exam. The exams are graded by a neutral professor who does not know from which class the students came. The data are shown.

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