A course in economics was taught to two groups of students, one in a classroom situation and the other online. There were 24 students in each group. The students were first paired according to cumulative grade point averages and background in economics, and then assigned to the courses by a flip of a coin. (The procedure was repeated 24 times.) At the end of the course each class was given the same final examination. Use the Wilcoxon test to test the hypothesis that the two methods of teaching are equally effective against a two-sided alternative.
The differences in the final scores for each pair of students were as follows (the online student€™s score was subtracted from the corresponding classroom student€™s score):

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