Table 1.

Chi‐square distribution table with three degrees of freedom, ${\chi }_{\alpha }^{}$ is the critical value of Chi‐square distribution, and α is significance level.

1 − α	χα	1 − α	χα
0.9	2.5	0.95	2.795
0.91	2.548	0.96	2.883
0.92	2.6	0.97	2.991
0.93	2.657	0.98	3.136
0.94	2.722	0.99	3.368