SHAZAM Critical Values of the t Distribution

Critical Values of the t Distribution

d.f.   alpha = .10   alpha = .05
1 6.314 12.706
2 2.920 4.303
3 2.353 3.182
4 2.132 2.776
5 2.015 2.571
6 1.943 2.447
7 1.895 2.365
8 1.860 2.306
9 1.833 2.262
10 1.812 2.228
11 1.796 2.201
12 1.782 2.179
13 1.771 2.160
14 1.761 2.145
15 1.753 2.131
16 1.746 2.120
17 1.740 2.110
18 1.734 2.101
19 1.729 2.093
20 1.725 2.086
21 1.721 2.080
22 1.717 2.074
23 1.714 2.069
24 1.711 2.064
25 1.708 2.060
26 1.706 2.056
27 1.703 2.052
28 1.701 2.048
29 1.699 2.045
30 1.697 2.042
40 * 1.684 2.021
60 * 1.671 2.000
  120 * 1.658 1.980
  > 120 1.645 1.960

*   Note: When the df exceeds 30 critical values are not tabulated for every case. An approach is to impute critical values by interpolation. However, the SHAZAM CONFID command uses the critical value for 40 df in situations where the df is in the range 31 - 40. The critical value for 60 df is used in situations where the df is in the range 41 - 60 and the critical value for 120 df is used in situations where the df is in the range 61 - 120.

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