The sixteen years old students of two different classes of the same high school were divided into 8 matched pairs, each pair having equal IQ's. One member of each pair was randomly selected to receive personal tutoring in physics. Then, all of the students were given a test (the total score is 100). Test results are summarized below. Do these results provide evidence that the personal tutoring helped or hurt student performance? Use a 0.05 a-level of significance.
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