Which of the following tests would be an example of a non-parametric method?
A) Wilcoxon signed rank sum test.
B) Kruskal-Wallis test.
C) Friedman test.
D) All these choices are correct.

Question

Quizplus · Accepted Answer

All three tests listed are examples of non-parametric methods. Non-parametric tests do not rely on assumptions about the underlying distribution of the data, and instead rely on rankings or other non-numerical data measures. The Wilcoxon signed rank sum test is used for comparing two related samples, the Kruskal-Wallis test is used for comparing three or more independent samples, and the Friedman test is used for comparing three or more related samples. Therefore, all of them can be considered as examples of non-parametric methods.

Which of the Following Tests Would Be an Example of a Non-Parametric