In Lecture 6, we defined the Wilcoxon rank sum test statistic W as the sum of the ranks of the Y observations in the combined sample. Now, let W' be the sum of the ranks of the X observations. Please verify the following equation: (m + n)(m + n + 1) W' + W = where m and n are number of X and Y observations, respectively.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.