APPENDIX A Tables and Formulas 741 TABLE A-7 Critical Values for the Sign 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) 1 * * * * 2 * * * * 3 * * * * 4 * * * * 5 * * * 0 6 * * 0 0 7 * 0 0 0 8 0 0 0 1 9 0 0 1 1 10 0 0 1 1 11 0 1 1 2 12 1 1 2 2 13 1 1 2 3 14 1 2 2 3 15 2 2 3 3 16 2 2 3 4 17 2 3 4 4 18 3 3 4 5 19 3 4 4 5 20 3 4 5 5 21 4 4 5 6 22 4 5 5 6 23 4 5 6 7 24 5 5 6 7 25 5 6 7 7 NOTES: 1. *indicates that it is not possible to get a value in the critical region, so fail to reject the null hypothesis. 2. Reject the null hypothesis if the number of the less frequent sign (x) is less than or equal to the value in the table. 3. For values of n greater than 25, a normal approximation is used with z = 1x + 0.52 - a n 2b 1 n 2
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