T critical values - Colorado State University

t critical values

Central area

-t critical

value

t curve

0

Confidence area captured:

Confidence level:

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Degrees of

Freedom

19

20

21

22

23

24

25

26

27

28

29

30

40

60

70

80

90

100

1000

z critical

values

¡Þ

¦Á for 2-tailed tests

¦Á for 1-tailed tests

t critical

value

0.90

90%

6.31

2.92

2.35

2.13

2.02

1.94

1.90

1.86

1.83

1.81

1.80

1.78

1.77

1.76

1.75

1.75

1.74

1.73

1.73

1.73

1.72

1.72

1.71

1.71

1.71

1.71

1.70

1.70

1.70

1.70

1.68

1.67

1.67

1.66

1.66

1.66

1.65

1.645

0.95

95%

12.71

4.30

3.18

2.78

2.57

2.45

2.37

2.31

2.26

2.23

2.20

2.18

2.16

2.15

2.13

2.12

2.11

2.10

2.09

2.09

2.08

2.07

2.07

2.06

2.06

2.06

2.05

2.05

2.05

2.04

2.02

2.00

1.99

1.99

1.99

1.98

1.96

1.96

0.98

98%

31.82

6.97

4.54

3.75

3.37

3.14

3.00

2.90

2.82

2.76

2.72

2.68

2.65

2.62

2.60

2.58

2.57

2.55

2.54

2.53

2.52

2.51

2.50

2.49

2.49

2.48

2.47

2.47

2.46

2.46

2.42

2.39

2.38

2.37

2.37

2.36

2.33

2.33

0.99

99%

63.66

9.93

5.84

4.60

4.03

3.71

3.50

3.36

3.25

3.17

3.11

3.06

3.01

2.98

2.95

2.92

2.90

2.88

2.86

2.85

2.83

2.82

2.81

2.80

2.79

2.78

2.77

2.76

2.76

2.75

2.70

2.66

2.65

2.64

2.63

2.63

2.58

2.58

0.10

0.05

0.05

0.025

0.02

0.01

0.01

0.005

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