Twelve adult males were put on a liquid diet in a weight-reducing plan. Weights were recorded before and after the diet. The data are shown in Table 14.10. Use the Wilcoxon signed rank test to ascertain whether the plan was successful. Do you think the use of this test is appropriate for this set of data? Comment.

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Table 14.10 Data for Exercise 2. SUBJECT 1 2 3 4 56 7 8 9 10 11 12 Before After 186 188 EE 177 168 191 172 177 191 170 188 187 177 176 169 196 172 165 190 165 180 181 172