Suppose you wanted to see if there was a difference between the participants in the control group and the experimental group for the pre-test and the post-test data. What is the correct expression for the test results?

A. U = 506, z = –0.830, p = .406 and U = 269.5, z = –2.682, p = .007
B. U = –0.830, z = 394, p = .406 and U = –2.682, z  = 269.5, p = .007
C. U = 0.406, z = –0.830, p = 394 and U = 0.007, z = –2.682, p = 269.5
D. U = 394, z = 0.406, p = –.830 and U = 269.5, z = 0.007, p = –2.682


Answer: A

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