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附表3 t值表

n’

P(2):

  P(1):

0.50

  0.25

0.20

  0.10

0.10

  0.05

0.05

  0.025

0.02

  0.01

0.01

  0.005

0.005

  0.0025

0.002

  0.001

0.001

  0.0005

1

  1.000 3.078 6.314 12.706 31.821 63.657 127.321 318.309 636.619

2

  0.816 1.886 2.920 4.303 6.965 9.925 14.089 22.327 31.599

3

  0.765 1.638 2.353 3.182 4.541 5.841 7.453 10.215 12.924

4

  0.741 1.533 2.132 2.776 3.747 4.604 5.598 7.173 8.610

5

  0.727 1.476 2.015 2.571 3.365 4.032 4.773 5.893 6.869

6

  0.718 1.440 1.943 2.447 3.143 3.707 4.317 5.208 5.959

7

  0.711 1.415 1.895 2.365 2.998 3.499 4.029 4.785 5.408

8

  0.706 1.397 1.860 2.306 2.896 3.355 3.833 4.501 5.041

9

  0.703 1.383 1.833 2.262 2.821 3.250 3.690 4.297 4.781

10

  0.700 1.372 1.812 2.228 2.764 3.169 3.581 4.144 4.587

11

  0.697 1.363 1.796 2.201 2.718 3.106 3.497 4.025 4.437

12

  0.695 1.356 1.782 2.179 2.681 3.055 3.428 3.930 4.318

13

  0.694 1.350 1.771 2.160 2.650 3.012 3.372 3.852 4.221

14

  0.692 1.345 1.761 2.145 2.624 2.977 3.326 3.787 4.140

15

  0.691 1.341 1.753 2.131 2.602 2.947 3.286 3.733 4.073

16

  0.690 1.337 1.746 2.120 2.583 2.921 3.252 3.686 4.015

17

  0.689 1.333 1.740 2.110 2.567 2.898 3.222 3.646 3.965

18

  0.688 1.330 1.734 2.101 2.552 2.878 3.197 3.610 3.922

19

  0.688 1.328 1.729 2.093 2.539 2.861 3.174 3.579 3.883

20

  0.687 1.325 1.725 2.086 2.528 2.845 3.153 3.552 3.850

21

  0.686 1.323 1.721 2.080 2.518 2.831 3.135 3.527 3.819

22

  0.686 1.321 1.717 2.074 2.508 2.819 3.119 3.505 3.792

23

  0.685 1.319 1.714 2.069 2.500 2.807 3.104 3.485 3.768

24

  0.685 1.318 1.711 2.064 2.492 2.797 3.091 3.467 3.745

25

  0.684 1.316 1.708 2.060 2.485 2.787 3.078 3.450 3.725

26

  0.684 1.315 1.706 2.056 2.479 2.779 3.067 3.435 3.707

27

  0.684 1.314 1.703 2.052 2.473 2.771 3.057 3.421 3.690

28

  0.683 1.313 1.701 2.048 2.467 2.763 3.047 3.408 3.674

29

  0.683 1.311 1.699 2.045 2.462 2.756 3.038 3.396 3.659

30

  0.683 1.310 1.697 2.042 2.457 2.750 3.030 3.385 3.646

31

  0.682 1.309 1.696 2.040 2.453 2.744 3.022 3.375 3.633

32

  0.682 1.309 1.694 2.037 2.449 2.738 3.015 3.365 3.622

33

  0.682 1.308 1.692 2.035 2.445 2.733 3.008 3.356 3.611

34

  0.682 1.307 1.091 2.032 2.441 2.728 3.002 3.348 3.601

35

  0.682 1.306 1.690 2.030 2.438 2.724 2.996 3.340 3.591

36

  0.681 1.306 1.688 2.028 2.434 2.719 2.990 3.333 3.582

37

  0.681 1.305 1.687 2.026 2.431 2.715 2.985 3.326 3.574

38

  0.681 1.304 1.686 2.024 2.429 2.712 2.980 3.319 3.566

39

  0.681 1.304 1.685 2.023 2.426 2.708 2.976 3.313 3.558

40

  0.681 1.303 1.684 2.021 2.423 2.704 2.971 3.307 3.551

50

  0.679 1.299 1.676 2.009 2.403 2.678 2.937 3.261 3.496

60

  0.679 1.296 1.671 2.000 2.390 2.660 2.915 3.232 3.460

70

  0.678 1.294 1.667 1.994 2.381 2.648 2.899 3.211 3.436

80

  0.678 1.292 1.664 1.990 2.374 2.639 2.887 3.195 3.416

90

  0.677 1.291 1.662 1.987 2.368 2.632 2.878 3.183 3.402

100

  0.677 1.290 1.660 1.984 2.364 2.626 2.871 3.174 3.390

200

  0.676 1.286 1.653 1.972 2.345 2.601 2.839 3.131 3.340

500

  0.675 1.283 1.648 1.965 2.334 2.586 2.820 3.107 3.310

1000

  0.675 1.282 1.646 1.962 2.330 2.581 2.813 3.098 3.300

  0.6745 1.2816 1.6449 1.9600 2.3263 2.5758 2.8070 3.0902 3.2905

  注:表上右上角图中的阴影部分表示概率P,P(2)是双侧的概率,P(1)是单侧的概率,n’是自由度。