You are performing the Wilcoxon rank sum test. The 13th through 15th values in an ordered array of pooled sample data all equal $180 (while the 12th value is less and the 16th value is more). What are the appropriate ranks for the three $180 values?
A) 12.5, 13, 14.5
B) 12.5, 13, 15
C) 13, 14, 15
D) 14, 14, 14

Question

Quizplus · Accepted Answer

When values are tied in the Wilcoxon rank sum test, they are assigned the average of the ranks they would have occupied if they were not tied. Here, the ranks for the 13th, 14th, and 15th positions are all 14.

You Are Performing the Wilcoxon Rank Sum Test