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Appendix E: Statistical Tables

Table E-1Critical Values of t (Two-Tailed)
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Table E-1 Critical Values of t (Two-Tailed)
...
Probability of Greater Value P
ν .50 .20 .10 .05 .02 .01 .005 .002 .001
1 1.000 3.078 6.314 12.706 31.821 63.657 127.321 318.309 636.619
2 .816 1.886 2.920 4.303 6.965 9.925 14.089 22.327 31.599
3 .765 1.638 2.353 3.182 4.541 5.841 7.453 10.215 12.924
4 .741 1.533 2.132 2.776 3.747 4.604 5.598 7.173 8.610
5 .727 1.476 2.015 2.571 3.365 4.032 4.773 5.893 6.869
6 .718 1.440 1.943 2.447 3.143 3.707 4.317 5.208 5.959
7 .711 1.415 1.895 2.365 2.998 3.499 4.029 4.785 5.408
8 .706 1.397 1.860 2.306 2.896 3.355 3.833 4.501 5.041
9 .703 1.383 1.833 2.262 2.821 3.250 3.690 4.297 4.781
10 .700 1.372 1.812 2.228 2.764 3.169 3.581 4.144 4.587
11 .697 1.363 1.796 2.201 2.718 3.106 3.497 4.025 4.437
12 .695 1.356 1.782 2.179 2.681 3.055 3.428 3.930 4.318
13 .694 1.350 1.771 2.160 2.650 3.012 3.372 3.852 4.221
14 .692 1.345 1.761 2.145 2.624 2.977 3.326 3.787 4.140
15 .691 1.341 1.753 2.131 2.602 2.947 3.286 3.733 4.073
16 .690 1.337 1.746 2.120 2.583 2.921 3.252 3.686 4.015
17 .689 1.333 1.740 2.110 2.567 2.898 3.222 3.646 3.965
18 .688 1.330 1.734 2.101 2.552 2.878 3.197 3.610 3.922
19 .688 1.328 1.729 2.093 2.539 2.861 3.174 3.579 3.883
20 .687 1.325 1.725 2.086 2.528 2.845 3.153 3.552 3.850
21 .686 1.323 1.721 2.080 2.518 2.831 3.135 3.527 3.819
22 .686 1.321 1.717 2.074 2.508 2.819 3.119 3.505 3.792
23 .685 1.319 1.714 2.069 2.500 2.807 3.104 3.485 3.768
24 .685 1.318 1.711 2.064 2.492 2.797 3.091 3.467 3.745
25 .684 1.316 1.708 2.060 2.485 2.787 3.078 3.450 3.725
26 .684 1.315 1.706 2.056 2.479 2.779 3.067 3.435 3.707
27 .684 1.314 1.703 2.052 2.473 2.771 3.057 3.421 3.690
28 .683 1.313 1.701 2.048 2.467 2.763 3.047 3.408 3.674
29 .683 1.311 1.699 2.045 2.462 2.756 3.038 3.396 3.659
30 .683 1.310 1.697 2.042 2.457 2.750 3.030 3.385 3.646
31 .682 1.309 1.696 2.040 2.453 2.744 3.022 3.375 3.633
32 .682 1.309 1.694 2.037 2.449 2.738 3.015 3.365 3.622
33 .682 1.308 1.692 2.035 2.445 2.733 3.008 3.356 3.611
34 .682 1.307 1.691 2.032 2.441 2.728 3.002 3.348 3.601
35 .682 1.306 1.690 2.030 2.438 2.724 2.996 3.340 3.591
36 .681 1.306 1.688 2.028 2.434 2.719 2.990 3.333 3.582
37 .681 1.305 1.687 2.026 2.431 2.715 2.985 3.326 3.574
38 .681 1.304 1.686 2.024 2.429 2.712 2.980 3.319 3.566
39 .681 1.304 1.685 2.023 2.426 2.708 2.976 3.313 3.558
40 .681 1.303 1.684 2.021 2.423 2.704 2.971 3.307 3.551
42 .680 1.302 1.682 2.018 2.418 2.698 2.963 3.296 3.538
44 .680 1.301 1.680 2.015 2.414 2.692 2.956 3.286 3.526
46 .680 1.300 1.679 2.013 2.410 2.687 2.949 3.277 3.515
48 .680 1.299 1.677 2.011 2.407 2.682 2.943 3.269 3.505
50 .679 1.299 1.676 2.009 2.403 2.678 2.937 3.261 3.496
52 .679 1.298 1.675 2.007 2.400 2.674 2.932 3.255

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