A non-parametric method to compare two populations, when the samples are matched pairs and the data are ordinal, is the:
A) Wilcoxon signed rank sum test.
B) sign test.
C) Wilcoxon rank sum test.
D) matched pairs t-test.

Question

Quizplus · Accepted Answer

The sign test is the best choice for comparing two populations with matched pairs and ordinal data. It is non-parametric and requires only the sign (positive or negative) of the difference between the pairs, making it a good choice when the data do not meet the assumptions of parametric tests. The Wilcoxon signed rank sum test and the Wilcoxon rank sum test are also non-parametric tests, but they are suited for comparing two independent populations rather than matched pairs. The matched pairs t-test, on the other hand, assumes normality of the data and is therefore not the best choice when dealing with ordinal data.

A Non-Parametric Method to Compare Two Populations, When the Samples