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PERCENTAGE POINTS OF THE T DISTRIBUTION
Tail Probabilities
One Tail 0.10 0.05 0.025 0.01 0.005 0.001 0.0005
Two Tails 0.20 0.10 0.05 0.02 0.01 0.002 0.001
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D 1 | 3.078 6.314 12.71 31.82 63.66 318.3 637 | 1
E 2 | 1.886 2.920 4.303 6.965 9.925 22.330 31.6 | 2
G 3 | 1.638 2.353 3.182 4.541 5.841 10.210 12.92 | 3
R 4 | 1.533 2.132 2.776 3.747 4.604 7.173 8.610 | 4
E 5 | 1.476 2.015 2.571 3.365 4.032 5.893 6.869 | 5
E 6 | 1.440 1.943 2.447 3.143 3.707 5.208 5.959 | 6
S 7 | 1.415 1.895 2.365 2.998 3.499 4.785 5.408 | 7
8 | 1.397 1.860 2.306 2.896 3.355 4.501 5.041 | 8
O 9 | 1.383 1.833 2.262 2.821 3.250 4.297 4.781 | 9
F 10 | 1.372 1.812 2.228 2.764 3.169 4.144 4.587 | 10
11 | 1.363 1.796 2.201 2.718 3.106 4.025 4.437 | 11
F 12 | 1.356 1.782 2.179 2.681 3.055 3.930 4.318 | 12
R 13 | 1.350 1.771 2.160 2.650 3.012 3.852 4.221 | 13
E 14 | 1.345 1.761 2.145 2.624 2.977 3.787 4.140 | 14
E 15 | 1.341 1.753 2.131 2.602 2.947 3.733 4.073 | 15
D 16 | 1.337 1.746 2.120 2.583 2.921 3.686 4.015 | 16
O 17 | 1.333 1.740 2.110 2.567 2.898 3.646 3.965 | 17
M 18 | 1.330 1.734 2.101 2.552 2.878 3.610 3.922 | 18
19 | 1.328 1.729 2.093 2.539 2.861 3.579 3.883 | 19
20 | 1.325 1.725 2.086 2.528 2.845 3.552 3.850 | 20
21 | 1.323 1.721 2.080 2.518 2.831 3.527 3.819 | 21
22 | 1.321 1.717 2.074 2.508 2.819 3.505 3.792 | 22
23 | 1.319 1.714 2.069 2.500 2.807 3.485 3.768 | 23
24 | 1.318 1.711 2.064 2.492 2.797 3.467 3.745 | 24
25 | 1.316 1.708 2.060 2.485 2.787 3.450 3.725 | 25
26 | 1.315 1.706 2.056 2.479 2.779 3.435 3.707 | 26
27 | 1.314 1.703 2.052 2.473 2.771 3.421 3.690 | 27
28 | 1.313 1.701 2.048 2.467 2.763 3.408 3.674 | 28
29 | 1.311 1.699 2.045 2.462 2.756 3.396 3.659 | 29
30 | 1.310 1.697 2.042 2.457 2.750 3.385 3.646 | 30
32 | 1.309 1.694 2.037 2.449 2.738 3.365 3.622 | 32
34 | 1.307 1.691 2.032 2.441 2.728 3.348 3.601 | 34
36 | 1.306 1.688 2.028 2.434 2.719 3.333 3.582 | 36
38 | 1.304 1.686 2.024 2.429 2.712 3.319 3.566 | 38
40 | 1.303 1.684 2.021 2.423 2.704 3.307 3.551 | 40
42 | 1.302 1.682 2.018 2.418 2.698 3.296 3.538 | 42
44 | 1.301 1.680 2.015 2.414 2.692 3.286 3.526 | 44
46 | 1.300 1.679 2.013 2.410 2.687 3.277 3.515 | 46
48 | 1.299 1.677 2.011 2.407 2.682 3.269 3.505 | 48
50 | 1.299 1.676 2.009 2.403 2.678 3.261 3.496 | 50
55 | 1.297 1.673 2.004 2.396 2.668 3.245 3.476 | 55
60 | 1.296 1.671 2.000 2.390 2.660 3.232 3.460 | 60
65 | 1.295 1.669 1.997 2.385 2.654 3.220 3.447 | 65
70 | 1.294 1.667 1.994 2.381 2.648 3.211 3.435 | 70
80 | 1.292 1.664 1.990 2.374 2.639 3.195 3.416 | 80
100 | 1.290 1.660 1.984 2.364 2.626 3.174 3.390 | 100
150 | 1.287 1.655 1.976 2.351 2.609 3.145 3.357 | 150
200 | 1.286 1.653 1.972 2.345 2.601 3.131 3.340 | 200
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Two Tails 0.20 0.10 0.05 0.02 0.01 0.002 0.001
One Tail 0.10 0.05 0.025 0.01 0.005 0.001 0.0005
Tail Probabilities
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This table was calculated by APL programs written by
William Knight. The format of the
table is adapted from a table constructed by Drake Bradley, Department of
Psychology, Bates College, Lewiston-Ashburn, Maine, U.S.A.
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