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

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The Wilcoxon rank-sum test involves ranking all the values in the pooled sample data, and then summing the ranks for the values in each group being compared. Because the values in question are all the same, they should all have the same rank. In this case, there are three such values (13^th through 15^th), so they should all be assigned the same rank. The rank assigned to a value is the average of the ranks that would be assigned if there were ties. Therefore, the ranks for the $180 values are all 14.

You Are Performing the Wilcoxon Rank-Sum Test