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Three students took a statistics test before and after coaching, but coaching did not effect the...

Three students took a statistics test before and after coaching, but coaching did not effect the scores of students i.e mean change in scores is zero. Their scores are as follows: Students A B C Before 70 88 62 After 71 89 56

Find the value of test statistic-t for matched pairs.(Round off up to 3 decimal places)

Math   Statistics-And-Probability   
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