Comparaisons cherchant à montrer une diff érence (en général un bénéfi ce)
87
Tableau X – Table du test de Student. Formulation bilatérale.
Degrés de liberté
0,10
0,05
0,02
0,01
0,002
0,001
1
6,314
12,706
31,82
63,66
318,3
636,.6
2
2,920
4,303
6,695
9,925
22,33
31,60
3
2,353
3,182
4,541
5,841
10,21
12,92
4
2,132
2,776
3,747
4,604
7,173
8,610
5
2,015
2,571
3,365
4,032
5,893
6,869
6
1,943
2,447
3,143
3,707
5,208
5,959
7
1,895
2,365
2,998
3,499
4,785
5,408
8
1,860
2,306
2,896
3,355
4,501
5,041
9
1,833
2,262
2,821
3,250
4,297
4,781
10
1,812
2,228.
2,764
3,169
4,144
4,587
11
1,796
2,201
2,718
3,106
4,025
4,437
12
1,782
2,179
2,681
3,055
3,930
4,318
13
l,771
2,160
2,650
3,012
3,852
4,221
14
1,761
2,145
2,624
2,977
3,787
4,140
15
1,753
2,131
2,602
2,947
3,733
4,073
16
1,746
2,120
2,583
2,921
3,686
4,015
17
1,740
2,110
2,567
2,898
3,646
3,965
18
1,734
2,101
2,552
2,878
3,610
3,922
19
1,729
2,093
2,539
2,861
3,579
3,883
20
1,725
2,086
2,528
2,845
3,552
3,850
21
1,721
2,080
2,518
2;831
3,527
3,819
22
1,717
2,074
2,508
2,819
3,505
3,792
23
1,714
2;069
2,500
2,807
3,485
3,767
24
1,711
2,064
2,492
2,797
3,467
3,745
25
1,708
2,060
.2,485
2,787
3,450
3,725
26
1,706
2,056
2,479
2,779
3,435
3,707
27
1,703
2,052
2,473
2,771
3,421
3,690
28
1,701
2,048
2,467
2,763
3,408
3,674
29
1,699
2,045
2,462
2,756
3,396
3,659
30
1,697
2,042
2,457
2,750
3,385
3,646
40
1,684
2,021
4,423
2,704
3,307
3,551
60
1,671
2,000
2,390
2,660
3,232
3,460
120
1,658
1,980
2,358
2,617
3,160
3,373
f (normale)
1,645
1,960
2,326
2,576
3,090
3,291