The Kruskal-Wallis test is most useful when
A)Excel is unavailable and hand calculations are required.
B)the sampled populations are normal with no outliers.
C)we need to compare the means instead of the medians.
D)observed data values are only ordinal measurements.

Question

Quizplus · Accepted Answer

The Kruskal-Wallis test is designed to test whether there is a significant difference in the medians of two or more independent groups, when the data is measured on an ordinal scale. It does not assume that the populations are normally distributed, nor that there are no outliers. Therefore, the correct answer is D, as the test is most useful when observed data values are only ordinal measurements.

The Kruskal-Wallis Test Is Most Useful When