Two methods of memorizing difficult material are being tested to determine if one produces better retention. Nine pairs of students are included in the study. The students in each p air are matched according to IQ and academic background and then assigned to the two methods at random. A memorization test is given to all the students, and the following scores are obtained:

At a = .05, test to determine if there is a significant difference in the effectiveness of the two methods.

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3 1 2 4 6 7 8 9 Method A 90 86 72 65 44 52 66 38 83 Method B 85 87 70 62 44 53 62 35 86 Pair 5 لیا