The Wilcoxon rank sum test and the Kruskall-Wallis test both require that we take independent random samples.

Question

Quizplus · Accepted Answer

Both the Wilcoxon rank sum test and the Kruskall-Wallis test assume that the samples are independent and randomly selected. The independence assumption is important because it ensures that the observations are not related to each other and that any differences between the groups are not due to some confounding factor. The random sampling assumption is also important because it allows us to make inferences about the population based on the sample data.

The Wilcoxon Rank Sum Test and the Kruskall-Wallis Test Both