740 APPENDIX A Tables and Formulas TABLE A-6 Critical Values of the Pearson Correlation Coefficient r n a = .05 a = .01 4 .950 .990 5 .878 .959 6 .811 .917 7 .754 .875 8 .707 .834 9 .666 .798 10 .632 .765 11 .602 .735 12 .576 .708 13 .553 .684 14 .532 .661 15 .514 .641 16 .497 .623 17 .482 .606 18 .468 .590 19 .456 .575 20 .444 .561 25 .396 .505 30 .361 .463 35 .335 .430 40 .312 .402 45 .294 .378 50 .279 .361 60 .254 .330 70 .236 .305 80 .220 .286 90 .207 .269 100 .196 .256 NOTE: To test H0: r = 0 (no correlation) against H1: r ≠ 0 (correlation), reject H0 if the absolute value of r is greater than or equal to the critical value in the table.
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