Table 2

5% and 1% points for the distribution of the correlation coefficient under the null hypothesis that the population correlation is 0 in a two-tailed test

r values for two-tailed probabilities (P)
Two-tailed probabilities (P)


Sample size
 0.05
 0.01
 Sample size
 0.05
 0.01
3
 1.00
 1.00
 23
 0.41
 0.53
4
 0.95
 0.99
 24
 0.40
 0.52
5
 0.88
 0.96
 25
 0.40
 0.51
6
 0.81
 0.92
 26
 0.39
 0.50
7
 0.75
 0.87
 27
 0.38
 0.49
8
 0.71
 0.83
 28
 0.37
 0.48
9
 0.67
 0.80
 29
 0.37
 0.47
10
 0.63
 0.76
 30
 0.36
 0.46
11
 0.60
 0.73
 40
 0.31
 0.40
12
 0.58
 0.71
 50
 0.28
 0.36
13
 0.55
 0.68
 60
 0.25
 0.33
14
 0.53
 0.66
 70
 0.24
 0.31
15
 0.51
 0.64
 80
 0.22
 0.29
16
 0.50
 0.62
 90
 0.21
 0.27
17
 0.48
 0.61
 100
 0.20
 0.26
18
 0.47
 0.59
 110
 0.19
 0.24
19
 0.46
 0.58
 120
 0.18
 0.23
20
 0.44
 0.56
 130
 0.17
 0.23
21
 0.43
 0.55
 140
 0.17
 0.22
22
 0.42
 0.54
 150
 0.16
 0.21

Generated using the standard formula [2].

Bewick et al. Critical Care 2003 7:451   doi:10.1186/cc2401