n'

P(2)：双侧

P(1)：单侧

0.5

0.25

0.2

0.1

0.1

0.05

0.05

0.025

0.02

0.01

0.01

0.005

0.005

0.0025

0.002

0.001

1

1

3.078

6.314

12.706

31.821

63.657

127.321

318.309

2

0.816

1.886

2.92

4.303

6.965

9.925

14.089

22.327

3

0.765

1.638

2.353

3.182

4.541

5.841

7.453

10.215

4

0.741

1.533

2.132

2.776

3.747

4.604

5.598

7.173

5

0.727

1.476

2.015

2.571

3.365

4.032

4.773

5.893