| Degrees of Freedom (N-1) | 90% | 95% | 99% |
| 1 | 6.31 | 12.70 | 63.7 |
| 2 | 2.92 | 4.30 | 9.92 |
| 3 | 2.35 | 3.18 | 5.84 |
| 4 | 2.13 | 2.78 | 4.60 |
| 5 | 2.02 | 2.57 | 4.03 |
| 6 | 1.94 | 2.45 | 3.71 |
| 7 | 1.90 | 2.36 | 3.50 |
| 8 | 1.86 | 2.31 | 3.36 |
| 9 | 1.83 | 2.26 | 3.25 |
| 10 | 1.81 | 2.23 | 3.17 |
| 11 | 1.80 | 2.20 | 3.11 |
| 12 | 1.78 | 2.18 | 3.06 |
| 13 | 1.77 | 2.16 | 3.01 |
| 14 | 1.76 | 2.14 | 2.98 |
| infinite | 1.64 | 1.96 | 2.58 |