The normal approximation to the Wilcoxon signed rank sum test is used whenever the number of none zero differences is 50 or more.
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Q. 2A one-sample t-test corresponds to a Kruskal-Wallis test.
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Q. 3Kruskal-Wallis test is a nonparametric test that can be used to compare more than two independent samples when the assumptions for an analysis of variance are invalid.
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Q. 4In a Wilcoxon signed rank test, the test statistic is calculated as T = 75 . If there are n = 15 observations for which the difference is not zero, and a two-tailed test is performed at the 5 significance level, then:
a. reject the null hypothesis
b. don't reject the null hypothesis
c. the test results are inconclusive
d. perform a parametric test
e. perform a chi-square test
Q. 5In a Wilcoxon signed rank test for matched pairs with n = 32, the rank sums of the positive and negative differences are 367.5 and 160.5, respectively. The value of the standardized test statistic z is:
a. 3.764
b. 1.882
c. 1.391
d. 1.935
e. 1.986
Q. 6A nonparametric method to compare two populations, when the samples are matched pairs and the data are interval, and where the normality requirement necessary to perform the parametric test is unsatisfied, is the:
a. Wilcoxon rank sum test
b. sign test
c. matched pairs t-test
d. Wilcoxon signed rank test
e. matched pairs z-test
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