Appendix Table A


 

Table A.  Probabilities related to multiples of standard deviations for a Normal distribution
Number of standard deviations (z) Probability of getting an observation at least as far from the mean (two sided P)
0.0 1.00
0.1 0.92
0.2 0.84
0.3 0.76
0.4 0.69
0.5 0.62
0.6 0.55
0.674 0.500
   
0.7 0.48
0.8 0.42
0.9 0.37
1.0 0.31
1.1 0.27
1.2 0.23
1.3 0.19
1.4 0.16
1.5 0.13
1.6 0.11
1.645 0.100
1.7 0.089
1.8 0.072
1.9 0.057
1.96 0.050
   
2.0 0.045
2.1 0.036
2.2 0.028
2.3 0.021
2.4 0.0016
2.5 0.0012
2.576 0.0010
   
3.0 0.0027
3.291 0.0010