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Appendix - Table III:  Student's t Test


Table 3: Student's t Test

(If calculated t is greater than value shown, reject the null hypothesis.)

 SIGNIFICANCE LEVEL FOR ONE-DIRECTION TEST
df
.10
.05
.025
.01
.005
.000
1
3.078
6.314
12.706
31.821
63.657
636.619
2
1.886
2.920
4.303
6.965
9.925
31.598
3
1.638
2.353
3.182
4.541
5.841
12.941
4
1.533
2.132
2.776
3.747
4.604
8.610
5
1.476
2.015
2.571
3.365
4.032
6.859
6
1.440
1.943
2.447
3.143
3.707
5.959
7
1.415
1.895
2.365
2.998
3.499
5.405
8
1.397
1.860
2.306
2.896
3.355
5.041
9
1.383
1.833
2.262
2.821
3.250
4.781
10
1.372
1.812
2.228
2.764
3.169
4.587
11
1.363
1.796
2.201
2.718
3.106
4.437
12
1.356
1.782
2.179
2.681
3.055
4.318
13
1.350
1.771
2.160
2.650
3.012
4.221
14
1.345
1.761
2.145
2.624
2.977
4.140
15
1.341
1.753
2.131
2.602
2.947
4.073
16
1.337
1.746
2.120
2.583
2.921
4.015
17
1.333
1.740
2.110
2.567
2.898
3.965
18
1.330
1.734
2.101
2.552
2.878
3.922
19
1.328
1.729
2.093
2.539
2.861
3.883
20
1.325
1.725
2.086
2.528
2.845
3.850
21
1.323
1.721
2.080
2.518
2.831
3.819
22
1.321
1.717
2.074
2.508
2.819
3.792
23
1.319
1.714
2.069
2.500
2.807
3.767
24
1.318
1.711
2.064
2.492
2.797
3.745
25
1.316
1.708
2.060
2.485
2.787
3.725
26
1.315
1.706
2.056
2.479
2.779
3.707
27
1.314
1.703
2.052
2.473
2.771
3.690
28
1.313
1.701
2.048
2.467
2.763
3.674
29
1.311
1.699
2.045
2.462
2.756
3.659
30
1.310
1.697
2.042
2.457
2.750
3.646
40
1.303
1.684
2.021
2.423
2.704
3.551
60
1.296
1.671
2.000
2.390
2.660
3.460
120
1.289
1.658
1.980
2.358
2.617
3.373
X
1.282
1.645
1.960
2.326
2.576
3.291

 

 SIGNIFICANCE LEVEL FOR ONE-DIRECTION TEST
df
.20
.10
.05
.02
.01
.001
1
3.078
6.314
12.706
31.821
63.657
636.619
2
1.886
2.920
4.303
6.965
9.925
31.598
3
1.638
2.353
3.182
4.541
5.841
12.941
4
1.533
2.132
2.776
3.747
4.604
8.610
5
1.476
2.015
2.571
3.365
4.032
6.859
6
1.440
1.943
2.447
3.143
3.707
5.959
7
1.415
1.895
2.365
2.998
3.499
5.405
8
1.397
1.860
2.306
2.896
3.355
5.041
9
1.383
1.833
2.262
2.821
3.250
4.781
10
1.372
1.812
2.228
2.764
3.169
4.587
11
1.363
1.796
2.201
2.718
3.106
4.437
12
1.356
1.782
2.179
2.681
3.055
4.318
13
1.350
1.771
2.160
2.650
3.012
4.221
14
1.345
1.761
2.145
2.624
2.977
4.140
15
1.341
1.753
2.131
2.602
2.947
4.073
16
1.337
1.746
2.120
2.583
2.921
4.015
17
1.333
1.740
2.110
2.567
2.898
3.965
18
1.330
1.734
2.101
2.552
2.878
3.922
19
1.328
1.729
2.093
2.539
2.861
3.883
20
1.325
1.725
2.086
2.528
2.845
3.850
21
1.323
1.721
2.080
2.518
2.831
3.819
22
1.321
1.717
2.074
2.508
2.819
3.792
23
1.319
1.714
2.069
2.500
2.807
3.767
24
1.318
1.711
2.064
2.492
2.797
3.745
25
1.316
1.708
2.060
2.485
2.787
3.725
26
1.315
1.706
2.056
2.479
2.779
3.707
27
1.314
1.703
2.052
2.473
2.771
3.690
28
1.313
1.701
2.048
2.467
2.763
3.674
29
1.311
1.699
2.045
2.462
2.756
3.659
30
1.310
1.697
2.042
2.457
2.750
3.646
40
1.303
1.684
2.021
2.423
2.704
3.551
60
1.296
1.671
2.000
2.390
2.660
3.460
120
1.289
1.658
1.980
2.358
2.617
3.373
X
1.282
1.645
1.960
2.326
2.576
3.291


 
 
 
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