Degree of freedom

Significance level

Two-sided test

90%

95%

99%

99.9%

90%

0.1

0.05

0.01

0.001

0.1

1

6.31

12.71

63.66

637

3.08

2

2.92

4.30

9.92

31.6

1.89

3

2.35

2.18

5.84

12.9

1.64

4

2.13

2.78

4.60

8.61

1.53

5

2.02

2.57

4.03

6.87

1.48

6

1.94

2.45

3.71

5.96

1.44

7

1.89

2.36

3.50

5.41

1.41

8

1.86

2.31

3.36

5.04

1.40

9

1.83

2.26

3.25

4.78

1.38

10

1.81

2.23

3.17

4.59

1.37

11

1.80

2.20

3.11

4.44

1.36

12

1.78

2.18

3.05

4.32

1.36

13

1.77

2.16

3.01

4.22

1.35

14

1.76

2.14

2.98

4.14

1.35

15

1.75

2.13

2.95

4.07

1.34

16

1.75

2.12

2.92

4.01

1.34

17

1.74

2.11

2.90

3.97

1.33