t-student
α'' = p g.l. 1 2 3 4 5 6 7 8 9 10
0.5 1.000 0.816 0.765 0.741 0.727 0.718 0.711 0.706 0.703 0.700
0.2 3.078 1.886 1.638 1.533 1.476 1.440 1.415 1.397 1.383 1.372
0.1 6.314 2.920 2.353 2.132 2.015 1.943 1.895 1.860 1.833 1.812
0.05 12.706 4.303 3.182 2.776 2.571 2.447 2.365 2.306 2.262 2.228
0.02 31.821 6.965 4.541 3.747 3.365 3.143 2.998 2.896 2.821 2.764
0.01 63.657 9.925 5.841 4.604 4.032 3.707 3.499 3.355 3.250 3.169
0.01 127.321 14.089 7.453 5.598 4.773 4.317 4.029 3.833 3.690 3.581
0 636.619 31.599 12.924 8.610 6.869 5.959 5.408 5.041 4.781 4.587
11 12 13 14 15 16 17 18 19 20
0.697 0.695 0.694 0.692 0.691 0.690 0.689 0.688 0.688 0.687
1.363 1.356 1.350 1.345 1.341 1.337 1.333 1.330 1.328 1.325
1.796 1.782 1.771 1.761 1.753 1.746 1.740 1.734 1.729 1.725
2.201 2.179 2.160 2.145 2.131 2.120 2.110 2.101 2.093 2.086
2.718 2.681 2.650 2.624 2.602 2.583 2.567 2.552 2.539 2.528
3.106 3.055 3.012 2.977 2.947 2.921 2.898 2.878 2.861 2.845
3.497 3.428 3.372 3.326 3.286 3.252 3.222 3.197 3.174 3.153
4.437 4.318 4.221 4.140 4.073 4.015 3.965 3.922 3.883 3.850
21 22 23 24 25 26 27 28 29 30
0.686 0.686 0.685 0.685 0.684 0.684 0.684 0.683 0.683 0.683
1.323 1.321 1.319 1.318 1.316 1.315 1.314 1.313 1.311 1.310
1.721 1.717 1.714 1.711 1.708 1.706 1.703 1.701 1.699 1.697
2.080 2.074 2.069 2.064 2.060 2.056 2.052 2.048 2.045 2.042
2.518 2.508 2.500 2.492 2.485 2.479 2.473 2.467 2.462 2.457
2.831 2.819 2.807 2.797 2.787 2.779 2.771 2.763 2.756 2.750
3.135 3.119 3.104 3.091 3.078 3.067 3.057 3.047 3.038 3.030
3.819 3.792 3.768 3.745 3.725 3.707 3.690 3.674 3.659 3.646
31 32 33 34 35 36 37 38 39 40
0.682 0.682 0.682 0.682 0.682 0.681 0.681 0.681 0.681 0.681
1.309 1.309 1.308 1.307 1.306 1.306 1.305 1.304 1.304 1.303
1.696 1.694 1.692 1.691 1.690 1.688 1.687 1.686 1.685 1.684
2.040 2.037 2.035 2.032 2.030 2.028 2.026 2.024 2.023 2.021
2.453 2.449 2.445 2.441 2.438 2.434 2.431 2.429 2.426 2.423
2.744 2.738 2.733 2.728 2.724 2.719 2.715 2.712 2.708 2.704
3.022 3.015 3.008 3.002 2.996 2.990 2.985 2.980 2.976 2.971
3.633 3.622 3.611 3.601 3.591 3.582 3.574 3.566 3.558 3.551
45 50 60 70 80 90 100 110 120 130 140 150 200 300 400 500 infinito
0.680 0.679 0.679 0.678 0.678 0.677 0.677 0.677 0.677 0.676 0.676 0.676 0.676 0.675 0.675 0.675 0.674
1.301 1.299 1.296 1.294 1.292 1.291 1.290 1.289 1.289 1.288 1.288 1.287 1.286 1.284 1.284 1.283 1.282
1.679 1.676 1.671 1.667 1.664 1.662 1.660 1.659 1.658 1.657 1.656 1.655 1.653 1.650 1.649 1.648 1.645
2.014 2.009 2.000 1.994 1.990 1.987 1.984 1.982 1.980 1.978 1.977 1.976 1.972 1.968 1.966 1.965 1.960
2.412 2.403 2.390 2.381 2.374 2.368 2.364 2.361 2.358 2.355 2.353 2.351 2.345 2.339 2.336 2.334 2.326
2.690 2.678 2.660 2.648 2.639 2.632 2.626 2.621 2.617 2.614 2.611 2.609 2.601 2.592 2.588 2.586 2.576
2.952 2.937 2.915 2.899 2.887 2.878 2.871 2.865 2.860 2.856 2.852 2.849 2.839 2.828 2.823 2.820 2.807
3.520 3.496 3.460 3.435 3.416 3.402 3.390 3.381 3.373 3.367 3.361 3.357 3.340 3.323 3.315 3.310 3.291