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APPENDIX 1. Critical values of t

df

One-sided

Two-sided

1

6.31

12.71

2

2.92

4.30

3

2.35

3.18

4

2.13

2.78

5

2.02

2.57

6

1.94

2.44

7

1.90

2.36

8

1.86

2.30

9

1.83

2.26

10

1.81

2.22

11

1.80

2.20

12

1.78

2.17

13

1.77

2.16

14

1.76

2.14

15

1.75

2.13

16

1.75

2.12

17

1.74

2.11

18

1.73

2.10

19

1.73

2.09

20

1.73

2.08

21

1.72

2.08

22

1.71

2.07

23

1.71

2.06

24

1.71

2.06

25

1.71

2.06

26

1.71

2.05

27

1.70

2.05

28

1.70

2.04

29

1.70

2.04

30

1.70

2.04

35

1.69

2.03

40

1.68

2.02

45

1.68

2.01

50

1.68

2.00

55

1.67

2.00

60

1.67

2.00

70

1.67

1.99

80

1.67

1.98

90

1.66

1.98

100

1.66

1.98

120

1.66

1.98

00

1.64

1.96


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