Use the following information to answer questions 16–19. A psychologist conducting research on the differences in aptitude between males and females found 10 pairs of twins wherein one of the twins was male and the other female. Results of the tests on their math and verbal skills are shown in the table.

Use a Wilcoxon matched-pairs signed-rank test to test the hypothesis that there is a difference between the scores of males and those of females on the verbal portion of the test. Use the MINITAB program.

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Twin 1 2 3 4 5 6 7 8 9 10 Male Math score 93 80 75 65 87 98 85 90 85 95 Verbal score 87 75 75 55 67 87 86 95 83 98 Female Math score 83 92 82 62 79 90 72 99 78 87 Verbal score 91 87 65 78 95 90 83 96 82 90