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t-test table
Explanations > Social Research > Analysis > t-test table
This table enables the t-value from a t-test to be converted to a statement about significance.
- Select the column with probability that you want.
- eg. 0.05 means '95% chance'
- Select the row for degrees of freedom.
- For two values, number of degrees of freedom is (n1 + n2)-2
- Compare the value in the cell with your t-value.
- The results are significant if the t-value is greater than the value in the cell.
| Degrees of Freedom | Probability, p | |||
| 0.1 | 0.05 | 0.01 | 0.001 | |
| 1 | 6.31 | 12.71 | 63.66 | 636.62 |
| 2 | 2.92 | 4.30 | 9.93 | 31.60 |
| 3 | 2.35 | 3.18 | 5.84 | 12.92 |
| 4 | 2.13 | 2.78 | 4.60 | 8.61 |
| 5 | 2.02 | 2.57 | 4.03 | 6.87 |
| 6 | 1.94 | 2.45 | 3.71 | 5.96 |
| 7 | 1.89 | 2.37 | 3.50 | 5.41 |
| 8 | 1.86 | 2.31 | 3.36 | 5.04 |
| 9 | 1.83 | 2.26 | 3.25 | 4.78 |
| 10 | 1.81 | 2.23 | 3.17 | 4.59 |
| 11 | 1.80 | 2.20 | 3.11 | 4.44 |
| 12 | 1.78 | 2.18 | 3.06 | 4.32 |
| 13 | 1.77 | 2.16 | 3.01 | 4.22 |
| 14 | 1.76 | 2.14 | 2.98 | 4.14 |
| 15 | 1.75 | 2.13 | 2.95 | 4.07 |
| 16 | 1.75 | 2.12 | 2.92 | 4.02 |
| 17 | 1.74 | 2.11 | 2.90 | 3.97 |
| 18 | 1.73 | 2.10 | 2.88 | 3.92 |
| 19 | 1.73 | 2.09 | 2.86 | 3.88 |
| 20 | 1.72 | 2.09 | 2.85 | 3.85 |
| 21 | 1.72 | 2.08 | 2.83 | 3.82 |
| 22 | 1.72 | 2.07 | 2.82 | 3.79 |
| 23 | 1.71 | 2.07 | 2.82 | 3.77 |
| 24 | 1.71 | 2.06 | 2.80 | 3.75 |
| 25 | 1.71 | 2.06 | 2.79 | 3.73 |
| 26 | 1.71 | 2.06 | 2.78 | 3.71 |
| 27 | 1.70 | 2.05 | 2.77 | 3.69 |
| 28 | 1.70 | 2.05 | 2.76 | 3.67 |
| 29 | 1.70 | 2.05 | 2.76 | 3.66 |
| 30 | 1.70 | 2.04 | 2.75 | 3.65 |
| 40 | 1.68 | 2.02 | 2.70 | 3.55 |
| 60 | 1.67 | 2.00 | 2.66 | 3.46 |
| 120 | 1.66 | 1.98 | 2.62 | 3.37 |
| infinity | 1.65 | 1.96 | 2.58 | 3.29 |
See also
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