tikfed

Variance is squared, removes the negative, and standard dev is obviously the square root of variance which makes it impossible to have a negative standard deviation.

Standard deviation can be zero, but never negative. Both sides of the distribution result in positive value for standard deviation.

I think you're thinking about this one a little too hard.



Edited 2 time(s). Last edit at Thursday, June 23, 2011 at 11:39AM by Chuckrox8.