Refer to Exercise 6.31.

a. What is the level of significance of the Wilcoxon signed-rank test?
b. Compare the levels of significance of the Wilcoxon signed-rank test, paired t test, and sign test for the data set in Exercise 6.31?
c. Place a 95% confidence interval on the mean difference between the responses from the two treatments.
d. Which of the three procedures, the Wilcoxon signed-rank test, paired t test or sign test, appears to be most valid test for this study?

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Twins 6 TreatmentA 48.3 44.6 49.7 40.5 54.3 55.6 458 35.4 Treatment B 43.5 43.8 53.7 43.9 544 54.7 45.2 34.4