In probablitiy, normal distribution what is the difference between standard deviation and variance?
2007-02-20 01:15:36 · 3 answers · asked by vinoth k 1 in Science & Mathematics ➔ Mathematics
If I remember my stats, the standard dev is the +/- value from the mean at which contains 67% of your data. In other words, the +/- region under the curve where 2/3 of your data exists. The variance is the sd/mean * 100, express in %
It's a good way to compare data. 2 populations can have the same mean, but one has a very big std dev, meaning it's data is spread out more. So the co of var would be a bigger %.
2007-02-20 01:25:34 · answer #1 · answered by Anonymous · 0⤊ 0⤋
SD is the positive square root of the variance, whatever be the distribution including Normal.
2007-02-20 13:21:16 · answer #2 · answered by Narayanan Venkata S 1 · 0⤊ 0⤋
The standard deviation is the square root of the variance, regardless of what distribution you are looking at (binomial, Poisson, uniform, etc).
2007-02-20 10:39:23 · answer #3 · answered by Steven314159 2 · 1⤊ 0⤋