Appendix A
Statistical Tables
Table A.1
Critical Student's t-test values (2-tailed) for significance levels 0.1, 0.05, and 0.01. Double the significance level for a 1-tailed test.
| Significance level | |||
|---|---|---|---|
| Degrees of freedom | 0.10 | 0.05 | 0.01 |
| 1 | 6.314 | 12.706 | 63.657 |
| 2 | 2.920 | 4.303 | 9.925 |
| 3 | 2.353 | 3.182 | 5.841 |
| 4 | 2.132 | 2.776 | 4.604 |
| 5 | 2.015 | 2.571 | 4.032 |
| 6 | 1.943 | 2.447 | 3.707 |
| 7 | 1.895 | 2.365 | 3.499 |
| 8 | 1.860 | 2.306 | 3.355 |
| 9 | 1.833 | 2.262 | 3.250 |
| 10 | 1.812 | 2.228 | 3.169 |
| 11 | 1.796 | 2.201 | 3.106 |
| 12 | 1.782 | 2.179 | 3.055 |
| 13 | 1.771 | 2.160 | 3.012 |
| 14 | 1.761 | 2.145 | 2.977 |
| 15 | 1.753 | 2.131 | 2.947 |
| 16 | 1.746 | 2.120 | 2.921 |
| 17 | 1.740 | 2.110 | 2.898 |
| 18 | 1.734 | 2.101 | 2.878 |
| 19 | 1.729 | 2.093 | 2.861 |
| 20 | 1.725 | 2.086 | 2.845 |
| 21 | 1.721 | 2.080 | 2.831 |
| 22 | 1.717 | 2.074 | 2.819 ... |
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