Question: Consider the sample data for grades A, B, C & D of four dierent classes, which are tabulated in table 3. Test whether the four

Consider the sample data for grades A, B, C & D of four dierent classes, which are tabulated in table 3. Test whether the four means are equal at the 0.05 level of signicance.

Perform a test that will compare all 4 means at once. We are not interested in pair-wise comparisons at this stage.

Please show all the steps in your calculations.

80818378

83797279

80838080

65768198

92658757

81746881

65346871

34457891

57615146

71696672

71596382

81676152

727564

818074

365578

8367

9194

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