Question: The accompanying table shows the grades for three randomly selected samples of students in economics, statistics, and accounting classes. Test the hypothesis that the mean grades are the same for all three classes. Use .05 for the level of significance.

Economics(X₁) Statistics(X₂) Accounting(X₃)

80 100 95

90 90 90

70 90 88

100 75 82

60 95 85

100 60

80

60