If there are three or more populations with ordinal data, what is the appropriate test to determine whether the distributions are equal?
A)Friedman test
B)t test
C)ANOVA
D)Kruskal-Wallis test

Question

Quizplus · Accepted Answer

The Kruskal-Wallis test is the appropriate test to determine whether the populations with ordinal data have equal distributions when there are three or more populations. The test is a non-parametric alternative to ANOVA and assumes that the populations have the same shape and variability but may differ in their location. The Friedman test is also a non-parametric test for three or more populations, but it is used when the data are matched or paired. The t test is appropriate for two populations, and ANOVA is appropriate for continuous data with normal distribution.

If There Are Three or More Populations with Ordinal Data