742 APPENDIX A Tables and Formulas TABLE A-8 Critical Values of T for the Wilcoxon Signed-Ranks Test a n .005 (one tail) .01 (two tails) .01 (one tail) .02 (two tails) .025 (one tail) .05 (two tails) .05 (one tail) .10 (two tails) 5 * * * 1 6 * * 1 2 7 * 0 2 4 8 0 2 4 6 9 2 3 6 8 10 3 5 8 11 11 5 7 11 14 12 7 10 14 17 13 10 13 17 21 14 13 16 21 26 15 16 20 25 30 16 19 24 30 36 17 23 28 35 41 18 28 33 40 47 19 32 38 46 54 20 37 43 52 60 21 43 49 59 68 22 49 56 66 75 23 55 62 73 83 24 61 69 81 92 25 68 77 90 101 26 76 85 98 110 27 84 93 107 120 28 92 102 117 130 29 100 111 127 141 30 109 120 137 152 NOTES: 1. *indicates that it is not possible to get a value in the critical region, so fail to reject the null hypothesis. 2. Conclusions: Reject the null hypothesis if the test statistic T is less than or equal to the critical value found in this table. Fail to reject the null hypothesis if the test statistic T is greater than the critical value found in the table. Based on data from Some Rapid Approximate Statistical Procedures, Copyright © 1949, 1964 Lederle Laboratories Division of American Cyanamid Company.
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