Discussion
Which test is used to assess the relationship between two ordinal variables ?
Answer: C
The relationship between two ordinal variables is assessed with Spearman's rho.
Spearman's rank-order correlation works on ranks, so it is the appropriate correlation coefficient when both variables are ordinal, for example the ranks of athletes in two competitions, or when interval data are not normally distributed.
Cramer's V and phi measure association between nominal variables (phi for 2 × 2 tables), and the chi-square test tests independence of categorical variables. None of them uses the order in ordinal data.
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