InfluentialPoints.com Biology, images, analysis, design... 

"It has long been an axiom of mine that the little things are infinitely the most important" 

Range Estimator TableRatio of σ to range for random samples of n observations from a normal distribution.
Conversely, for a standard normal distribution, the mean range of For example using R, for a sample of (n=) 13 observations from a standard normal distribution, you could enter this set of commands:
Which gave us a ratio of σ to range of 0.300
