t Table
| t-percentile | 0.90 | 0.95 | 0.975 | 0.99 | 0.995 |
| two tails | 0.20 | 0.10 | 0.05 | 0.02 | 0.01 |
| confidence | 0.80 | 0.90 | 0.95 | 0.98 | 0.99 |
| df | |||||
| 1 | 3.08 | 6.31 | 12.71 | 31.82 | 63.66 |
| 2 | 1.89 | 2.92 | 4.30 | 6.96 | 9.93 |
| 3 | 1.64 | 2.35 | 3.18 | 4.54 | 5.84 |
| 4 | 1.53 | 2.13 | 2.78 | 3.75 | 4.60 |
| 5 | 1.48 | 2.02 | 2.57 | 3.36 | 4.03 |
| 6 | 1.44 | 1.94 | 2.45 | 3.14 | 3.71 |
| 7 | 1.41 | 1.89 | 2.36 | 3.00 | 3.50 |
| 8 | 1.40 | 1.86 | 2.31 | 2.90 | 3.36 |
| 9 | 1.38 | 1.83 | 2.26 | 2.82 | 3.25 |
| 10 | 1.37 | 1.81 | 2.23 | 2.76 | 3.17 |
| 11 | 1.36 | 1.80 | 2.20 | 2.72 | 3.11 |
| 12 | 1.36 | 1.78 | 2.18 | 2.68 | 3.06 |
| 13 | 1.35 | 1.77 | 2.16 | 2.65 | 3.01 |
| 14 | 1.35 | 1.76 | 2.14 | 2.62 | 2.98 |
| 15 | 1.34 | 1.75 | 2.13 | 2.60 | 2.95 |
| 16 | 1.34 | 1.75 | 2.12 | 2.58 | 2.92 |
| 17 | 1.33 | 1.74 | 2.11 | 2.57 | 2.90 |
| 18 | 1.33 | 1.73 | 2.10 | 2.55 | 2.88 |
| 19 | 1.33 | 1.73 | 2.09 | 2.54 | 2.86 |
| 20 | 1.33 | 1.72 | 2.09 | 2.53 | 2.84 |
| 21 | 1.32 | 1.72 | 2.08 | 2.52 | 2.83 |
| 22 | 1.32 | 1.72 | 2.07 | 2.51 | 2.82 |
| 23 | 1.32 | 1.71 | 2.07 | 2.50 | 2.81 |
| 24 | 1.32 | 1.71 | 2.06 | 2.49 | 2.80 |
| 25 | 1.32 | 1.71 | 2.06 | 2.49 | 2.80 |
| 26 | 1.31 | 1.71 | 2.06 | 2.48 | 2.78 |
| 27 | 1.31 | 1.70 | 2.05 | 2.47 | 2.77 |
| 28 | 1.31 | 1.70 | 2.05 | 2.47 | 2.76 |
| 29 | 1.31 | 1.70 | 2.05 | 2.46 | 2.76 |
| 30 | 1.31 | 1.70 | 2.04 | 2.46 | 2.75 |
| 40 | 1.30 | 1.68 | 2.02 | 2.42 | 2.70 |
| 60 | 1.30 | 1.67 | 2.00 | 2.39 | 2.66 |
| 120 | 1.29 | 1.66 | 1.98 | 2.36 | 2.62 |
| infinite = Z | 1.28 | 1.64 | 1.96 | 2.33 | 2.58 |