To use the Wilcoxon Rank Sum Test as a test for location, we must assume that
A) both samples are randomly and independently drawn from their respective populations.
B) the obtained data are either ranks or numerical measurements that will be converted to combined ranks.
C) both underlying populations from which the samples were drawn are equivalent in shape and dispersion.
D) all of the above

Question

Quizplus · Accepted Answer

All of the above assumptions must be met in order to use the Wilcoxon Rank Sum Test as a test for location. Random and independent sampling ensures that the samples are representative of their respective populations. Using ranks or converting numerical measurements to ranks is necessary for the test. Equivalence in shape and dispersion of the populations is important for accurate comparison of the two samples.

To Use the Wilcoxon Rank Sum Test as a Test