If ordinal data are obtained from a two-group, between-subjects design (with random assignment of all subjects), the appropriate test would be
A) U
B) T
C) Spearman r
D) Friedman ANOVA by ranks

Question

Quizplus · Accepted Answer

The U test, also known as the Mann-Whitney U test, is appropriate for comparing two independent groups on an ordinal variable. It is a non-parametric alternative to the t-test (choice B) and is used when the assumptions of the t-test are not met, such as when the data are not interval or ratio level or not normally distributed. The Spearman r (choice C) is used for measuring the strength and direction of association between two ranked variables, and the Friedman ANOVA by ranks (choice D) is used for comparing more than two related groups on an ordinal variable.

If Ordinal Data Are Obtained from a Two-Group, Between-Subjects Design