Critical Values of Student's t
.10 .05 .025 .01 .005 .0005 1-tail
df .20 .10 .050 .02 .010 .0010 2-tail
1 3.078 6.314 12.706 31.821 63.657 636.619
2 1.886 2.920 4.303 6.965 9.925 31.599
3 1.638 2.353 3.182 4.541 5.841 12.924
4 1.533 2.132 2.776 3.747 4.604 8.610
5 1.476 2.015 2.571 3.365 4.032 6.869
6 1.440 1.943 2.447 3.143 3.707 5.959
7 1.415 1.895 2.365 2.998 3.499 5.408
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 3.768
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
35 1.306 1.690 2.030 2.438 2.724 3.591
40 1.303 1.684 2.021 2.423 2.704 3.551
45 1.301 1.679 2.014 2.412 2.690 3.520
50 1.299 1.676 2.009 2.403 2.678 3.496
55 1.297 1.673 2.004 2.396 2.668 3.476
60 1.296 1.671 2.000 2.390 2.660 3.460
65 1.295 1.669 1.997 2.385 2.654 3.447
70 1.294 1.667 1.994 2.381 2.648 3.435
75 1.293 1.665 1.992 2.377 2.643 3.425
80 1.292 1.664 1.990 2.374 2.639 3.416
85 1.292 1.663 1.988 2.371 2.635 3.409
90 1.291 1.662 1.987 2.368 2.632 3.402
95 1.291 1.661 1.985 2.366 2.629 3.396
100 1.290 1.660 1.984 2.364 2.626 3.390
120 1.289 1.658 1.980 2.358 2.617 3.373
140 1.288 1.656 1.977 2.353 2.611 3.361
160 1.287 1.654 1.975 2.350 2.607 3.352
180 1.286 1.653 1.973 2.347 2.603 3.345
200 1.286 1.653 1.972 2.345 2.601 3.340
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