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Appendix 2. Studentís t distribution

This table gives percentage points of the t distribution of n degrees of freedom. These are the values of t for which a given percentage, P, of the t distribution lies outside the range -t to +t. As the number of degrees of freedom increases, the distribution becomes closer to the standard normal distribution.

 

 

One-tailed

Two-tailed

 

Percentage (P)

Degree of freedom (v)

5%

1%

5%

1%

1

6.31

31.8

12.7

63.7

2

2.92

6.96

4.30

9.92

3

2.35

4.54

3.18

5.84

4

2.13

3.75

2.78

4.60

5

2.02

3.36

2.57

4.03

6

1.94

3.14

2.45

3.71

7

1.89

3.00

2.36

3.50

8

1.86

2.90

2.31

3.36

9

1.83

2.82

2.26

3.25

10

1.81

2.76

2.23

3.17

11

1.80

2.72

2.20

3.11

12

1.78

2.68

2.18

3.05

13

1.77

2.65

2.16

3.01

14

1.76

2.62

2.14

2.98

15

1.75

2.60

2.13

2.95

16

1.75

2.58

2.12

2.92

17

1.74

2.57

2.11

2.90

18

1.73

2.55

2.10

2.88

19

1.73

2.44

2.09

2.86

20

1.72

2.53

2.09

2.85

22

1.72

2.51

2.07

2.82

24

1.72

2.49

2.06

2.80

26

1.71

2.48

2.06

2.78

28

1.70

2.47

2.05

2.76

30

1.70

2.46

2.04

2.75

35

1.69

2.44

2.03

2.72

40

1.68

2.42

2.02

2.70

45

1.68

2.41

2.01

2.69

50

1.68

2.40

2.01

2.68

55

1.67

2.40

2.00

2.67

60

1.67

2.39

2.00

2.66

¥

1.64

2.33

1.96

2.58

 

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