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Use the level and power values for the paired t test and Wilcoxon signed-rank test given in Table 6.18 to answer the following questions.
a. For small sample sizes, n ≤ 20, does the actual level of the t test appear to deviate from the nominal level of a = .05?
b. Which type of deviations from a normal distribution, skewness or heavy-tailedness, appears to have the greater affect on the t test?
c. For small sample sizes, n = 20, does the actual level of the Wilcoxon signed-rank test appear to deviate from the nominal level of a = .05?
d. Which type of deviations from a normal distribution, skewness or heavy-tailedness, appears to have the greater effect on the Wilcoxon signed-rank test?
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