Table shows that, for example, a right‐tailed test, degrees of freedom () 15, and , .
Two‐sided confidence level
Two‐sided confidence level
0.80
0.90
0.95
0.98
0.99
0.80
0.90
0.95
0.98
0.99
for a right‐tailed test
for a right‐tailed test
0.10
0.05
0.025
0.01
0.005
0.10
0.05
0.025
0.01
0.005
1
3.078
6.314
12.706
31.821
63.657
31
1.309
1.696
2.040
2.453
2.744
2
1.886
2.920
4.303
6.965
9.925
32
1.309
1.694
2.037
2.449
2.738
3
1.638
2.353
3.182
4.541
5.841
33
1.308
1.692
2.035
2.445
2.733
4
1.533
2.132
2.776
3.747
4.604
34
1.307
1.691
2.032
2.441
2.728
5
1.476
2.015
2.571
3.365
4.032
35
1.306
1.690
2.030
2.438
2.724
6
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) 15, and 
, 
.
for a right‐tailed test
for a right‐tailed test
