In order to perform the ________________ test,all of the observations in two samples are combined into a single set and all of the values in the single set are ranked from smallest to largest.
A)Wilcoxon rank sum
B)Kruskal-Wallis
C)Wilcoxon signed rank
D)Sign

Question

Quizplus · Accepted Answer

The Wilcoxon rank sum test, also known as Mann-Whitney U test, compares two independent samples and determines whether they come from the same population or not. This test requires ranking all the observations from both samples combined and then calculating a statistic based on the ranks. Therefore, option A is the correct choice. Options B, C, and D are not relevant for this type of test. The Kruskal-Wallis test is used to compare three or more independent samples, the Wilcoxon signed rank test is used to compare paired samples, and the Sign test is used for small sample sizes or nonparametric distributional assumptions.

In Order to Perform the ________________ Test,all of the Observations