Nonparametric tests quiz
Parametric vs. nonparametric tests - Correct answer -parametric tests use sample
statistics to estimate population parameters requiring underlying assumptions be met
-nonparametric tests don't have the same stringent assumptions and can be used when
assumptions of parametric tests are not met
Parametric equivalent of Mann-Whitney/Wilcoxon rank-sum tests - Correct answer
independent t-test
Parametric equivalent of Wilcoxon signed rank test - Correct answer dependent t-test
Parametric equivalent of Kruskal-Wallis test - Correct answer independent ANOVA
Parametric equivalent of Friedman's test - Correct answer repeated measures ANOVA
When to use Mann-Whitney/Wilcoxon rank-sum tests - Correct answer to test
differences between 2 conditions in which different participants have been used
Mann-Whitney/Wilcoxon rank-sum tests work on the principle of - Correct answer -
ranking the data for each group
-lowest score = rank of 1
-tied ranks are given the same ranks: the average of potential ranks
Tests of normality - Correct answer -Kolmogorov-Smirnov
-Shapiro-Wilk
Test of homogeneity of variance - Correct answer -Levene's test
How to conduct Wilcoxon rank-sum and Mann-Whitney tests in SPSS - Correct answer
-Analyze-->nonparametric tests-->independent samples
-Fields-->use custom field assignments
-move DVs over to test fields
-groups = IV
-Settings-->customize tests-->Mann-Whitney
-double click on hypothesis test summary-->Model Viewer, gives you Wilcoxon results
and statistical information
Effect size for Wilcoxon rank-sum and Mann-Whitney tests - Correct answer -r = Z / sqrt
(N)
-Z = z-score that SPSS produces ("standardized test statistic")
