Geoscience Reference
In-Depth Information
Appendix A3
Critical Values of Student's
t
-Distribution
Degrees of
1-D
freedom
0.60
0.75
0.90
0.95
0.975
0.99
0.995
0.999
1
0.325
1.000
3.078
6.314
12.706
31.821
63.657
318.315
2
0.289
0.816
1.886
2.920
4.303
6.965
9.925
22.327
3
0.277
0.765
1.638
2.353
3.182
4.541
5.841
10.215
4
0.271
0.741
1.533
2.132
2.776
3.747
4.604
7.173
5
0.267
0.727
1.476
2.015
2.571
3.365
4.032
5.893
6
0.265
0.718
1.440
1.943
2.447
3.143
3.707
5.208
7
0.263
0.711
1.415
1.895
2.365
2.998
3.499
4.785
8
0.262
0.706
1.397
1.860
2.306
2.896
3.355
4.501
9
0.261
0.703
1.383
1.833
2.262
2.821
3.250
4.297
10
0.260
0.700
1.372
1.812
2.228
2.764
3.169
4.144
11
0.260
0.697
1.363
1.796
2.202
2.718
3.106
4.025
12
0.259
0.695
1.356
1.782
2.179
2.681
3.055
3.930
13
0.259
0.694
1.350
1.771
2.160
2.650
3.012
3.852
14
0.258
0.692
1.345
1.761
2.145
2.624
2.977
3.787
15
0.258
0.691
1.340
1.753
2.131
2.602
2.947
3.733
16
0.258
0.690
1.337
1.746
1.120
2.583
2.921
3.686
17
0.257
0.689
1.333
1.740
2.110
2.567
2.898
3.646
18
0.257
0.688
1.330
1.734
2.101
2.552
2.878
3.610
19
0.257
0.688
1.328
1.729
2.093
2.539
2.861
3.579
20
0.257
0.687
1.325
1.725
2.086
2.528
2.845
3.552
21
0.257
0.686
1.323
1.721
2.080
2.518
2.831
3.527
22
0.257
0.686
1.321
1.717
2.074
2.508
2.819
3.505
23
0.257
0.685
1.319
1.714
2.069
2.500
2.807
3.485
24
0.257
0.685
1.318
1.711
2.064
2.492
2.797
3.467
25
0.257
0.684
1.316
1.708
2.060
2.485
2.787
3.450
26
0.257
0.684
1.315
1.706
2.056
2.479
2.779
3.435
27
0.257
0.684
1.314
1.703
2.052
2.473
2.771
3.421
28
0.257
0.683
1.313
1.701
2.048
2.467
2.763
3.408
29
0.257
0.683
1.311
1.699
2.045
2.462
2.756
3.396
30
0.257
0.683
1.310
1.697
2.042
2.457
2.750
3.385
40
0.255
0.681
1.303
1.684
2.021
2.423
2.704
3.307
50
0.255
0.679
1.299
1.676
2.009
2.403
2.678
3.261
60
0.254
0.679
1.296
1.671
2.000
2.390
2.660
3.232
(
Contd.
)
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