1. A chemistry teacher conducted a 100-point pre-test at the beginning of the semester. The same test was given at the end of the semester. The accompanying table shows the scores of twelve randomly selected students. Compute the linear correlation coefficient. Student Pre-test Post test no. score, X score, Y 1 60 68 2 63 66 3 67 78 64 75 67 85 58 66 70 89 66 66 68 79 67 66 65 75 70 80 456 4 6 7 8 9 10 11 12

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