1. The improvements in scores between the pretest and the posttest for the 20 executives were: 20663323-6 6 6 6 30110 2 33 (a) Show the assignment of ranks and the calculation of the signed rank statistic W+ for these data. Remember that zeros are dropped from the data before ranking, so that n is the number of nonzero differences within pairs. (b) Now use software to implement the Wilcoxon signed rank procedure to reach a conclusion abou the effect of language instruction. State hypotheses in words and report the statistic W+, its P-value, and your conclusion.

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