A nonparametric method to compare two populations, when the samples are matched pairs and the data are ordinal, is the:

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The sign test is the best choice for comparing two populations when the samples are matched pairs and the data are ordinal. This is because the sign test does not make any assumptions about the distribution of the data and is specifically designed for a small sample size. The Wilcoxon signed rank sum test and Wilcoxon rank sum test are better suited for larger sample sizes or when the data are continuous, while the matched pairs t-test assumes normality of the data. The chi-square test is appropriate for nominal data, not ordinal data.

A Nonparametric Method to Compare Two Populations, When the Samples