In a study of three teaching methods, three teachers were selected to use the three methods to teach students over three terms. At the end of each term, the students were subjected to the same standard test. The data showing the scores of the students over the period of study are shown as follows: 

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Subjects Teachers Term1 Term2 Term3 Teacher1 1234567RADUATE 1234567820 1234567 Teacher2 Teacher3 80 80 80 82 79 80 82 75 83 83 75 77 84 74 85 85 84 83 84 87 85 80 81 80 80 PRANK%% KREKEERE PEERERER886