(Cont’d)

Level of significancefor one-tailedtest
.05.025.01

.10

.005

.0005

Level of significance for two-tailedtest
.10.05.02

df

.20

.01

.001

16
17
18
19
20

21
22
23
24
25

1.337
1.333
1.330
1.328
1.325

1.323
1.321
1.319
1.318
1.316

1.746
1.740
1.734
1.729
1.725

1.721
1.717
1.714
1.711
1.708

2.120
2.110
2.101
2.093
2.080

2.080
2.074
2.069
2.064
2.060

2.583
2.567
2.552
2.539
2.528

2.518
2.508
2.500
2.492
2.485

2.921
2.898
2.878
2.861
2.845

2.831
2.819
2.807
2.797
2.787

4.015
3.965
3.922
3.883
3.850

3.819
3.792
3.767
3.745
3.725

(Cont’d)

Level of significancefor one-tailedtest
.05.025.01

.10

.005

.0005

Level of significance for two-tailedtest
.10.05.02

df

.20

.01

.001

26
27
28
29
30

40
60
120

∞

1.315
1.314
1.313
1.311
1.310

1.303
1.296
1.289
1.282

1.706
1.703
1.701
1.699
1.697

1.684
1.671
1.658
1.645

2.056
2.052
2.048
2.045
2.042

2.021
2.000
1.980
1.960

2.479
2.473
2.467
2.462
2.457

2.423
2.390
2.358
2.326

2.779
2.771
2.763
2.756
2.750

2.704
2.660
2.617
2.576

3.707
3.690
3.674
3.659
3.646

3.551
3.460
3.373
3.291

Evaporated Metal

Sputtered Metal

.707

.791

.645

.764

.682

.782

.692

.788