ν	P（双侧）0.05	0.01	0.001	ν	0.05	0.01	0.001
	P（单侧）0.025	0.005	0.0005		0.025	0.005	0.0005
1	12.706	63.657	636.618	21	2.080	2.831	3.819
2	4.303	9.925	31.598	22	2.072	2.819	3.792
3	3.182	5.841	12.924	23	2.069	2.807	3.767
4	2.776	4.604	8.610	24	2.064	2.797	3.745
5	2.571	4.032	6.859	25	2.060	2.787	3.725
6	2.447	3.707	5.959	26	2.056	2.779	3.707
7	2.365	3.499	5.405	27	2.052	2.771	3.690
8	2.306	3.355	5.041	28	2.048	2.763	3.674
9	2.262	3.250	4.781	29	2.045	2.756	3.659
10	2.228	3.169	4.587	30	2.042	2.750	3.646
11	2.201	3.106	4.437	40	2.021	2.704	3.551
12	2.179	3.055	4.318	50	2.008	2.678	3.496
13	2.160	3.012	4.221	60	2.000	2.660	3.460
14	2.145	2.977	4.140	70	1.994	2.648	3.435
15	2.131	2.947	4.073	80	1.989	2.638	3.416
16	2.120	2.921	4.015	90	1.986	2.631	3.402
17	2.110	2.898	3.965	100	1.982	2.625	3.390
18	2.101	2.878	3.922	120	1.980	2.617	3.373
19	2.093	2.861	3.883	500	1.965	2.586	3.305
20	2.086	2.845	3.850	∞	1.960	2.576	3.291