Table 4.
Chi-square values for two confident levels
| Degrees of freedom | 90% | 95% |
| 1 | 2.71 | 3.84 |
| 2 | 4.61 | 5.99 |
| 3 | 6.25 | 7.81 |
| 4 | 7.78 | 9.49 |
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