The correct null hypothesis for a rank-order test comparing two groups is that
A)the moderate ranks are evenly distributed.
B)the highest ranks are evenly distributed.
C)the populations have equal means.
D)the medians of the two populations are equal.

Question

Quizplus · Accepted Answer

The correct null hypothesis for a rank-order test comparing two groups is that the medians of the two populations are equal. This is because the rank-order test is used to compare the central tendency (i.e., median) of two distributions, rather than the distribution itself. Therefore, the null hypothesis should state that the medians are equal, and the alternative hypothesis would state that they are not equal. Choices A and B are incorrect because they refer to the distribution of ranks, rather than the central tendency, while choice C is incorrect because it only applies to tests comparing means, not medians.

The Correct Null Hypothesis for a Rank-Order Test Comparing Two