CRITICALVALUESOFT

Level of significance for one-tailedtest
.05.025.01

Level of significance for two-tailed test
.10.05.02

.10

.005

.0005

df

1
2
3
4
5

6
7
8
9 10

11 12 13 14 15

.20

.01

.001

3.078 1.886 1.638 1.533 1.476

1.440 1.415 1.397 1.383 1.372

1.363 1.356 1.350 1.345 1.341

6.314 2.920 2.353 2.132 2.015

1.943 1.895 1.860 1.833 1.812

1.796 1.782 1.771 1.761 1.753

12.706
4.303
3.182
2.776
2.571

2.447
2.365
2.306
2.262
2.228

2.201
2.179
2.160
2.145
2.131

31.821
6.965
4.541
3.747
3.365

3.413
2.998
2.896
2.821
2.764

2.718
2.681
2.650
2.624
2.602

63.657
9.925
5.841
4.604
4.032

3.707
3.449
3.355
3.250
3.169

3.106
3.055
3.012
2.977
2.947

636.619
31.598
12.941
8.610
8.659

5.959 5.405 5.041 5.781 4.587

4.437 4.318 4.221 4.140 4.073