stupid newbie stats. qxn.

[LordSnailz]

sigma and stdev. are the same thing right?
Also, to match two gropus within 1.5 sigma means that that variation of the mean between group B from group A but be less than 1.5 right?

sorry for dumb question, long day today ...

tia!

 

[Radiohead]

Yeah, a lower case sigma = std dev. Uppercase is Sum Of

 

[minendo]

I thought sigma = 3(st dev)