File talk:Confidence interval and standard score.png

What is the use of this graph? It definitely is not what it says. I presume it shows on a log-scale the probability y for a standard normal distribution of values in the interval [-x,x].I.e. if Z is N(0,1)-distributed, y=P(|Z|<x). Nijdam (talk) 14:08, 7 May 2012 (UTC)