Ordering exam questions. An educational psychologist claims that the order in which test questions are asked affects a student’s ability to answer correctly. To investigate this assertion, a professor randomly divides a class of 13 students into two groups: 7 in one group and 6 in the other. The professor prepares one set of test questions, but arranges the questions in two different orders. On test A, the questions are arranged in order of increasing difficulty (i.e., from easiest to most difficult); on test B, the order is reversed. One group of students is given test A, the other test B, and the test score is recorded for each student. The results are shown in the next table:
TESTORDER
Test A | 90 | 71 | 83 | 82 | 75 | 91 | 65 |
Test B | 66 | 78 | 50 | 68 | 80 | 60 |
Use the Wilcoxon rank sum procedure to test for a difference (a shift in location) in the probability distributions of student scores on the two tests. Test using α = .05.
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