An experiment was performed to study three different methods of teaching pupil’s arithmetical skills of addition (A), multiplication (M), and subtraction

(S). The scores obtained from different groups of pupils used in the experiment are presented below as follows:

Can it be said that any of the methods used is better for teaching these mathematical skills?

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Group I Group II Group III A M S A M S AMS 87 56 76 66 39 79 56 35 96 84 51 69 60 32 64 50 33 80 86 42 77 74 38 80 50 47 89 74 40 69 76 43 83 52 44 87 80 42 70 60 42 82 50 38 84 78 45 71 60 37 72 42 38 84 72 40 62 63 39 67 55 42 86 55 55 58 75 33 77 60 39 79 85 54 69 80 40 72 51 35 68 52 43 87 60 40 70 58 50 70