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...

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 -level of signifcance.