Would someone who is good with math tell me how to find the Standard Deviation?

[Mears]

Ok, I know that the standard deviation is the square root of the variance? However, I don't remember how to find the variance. I looked on some web pages, but they all use greek symbols and I'm not very good at reading them. So could someone please explain how to find the variance?

 

[Viper GTS]

Here's a pretty easy one:

link

Terms you'll need to know
x = one value in your set of data
avg (x) = the mean (average) of all values x in your set of data
n = the number of values x in your set of data

For each value x, subtract the overall avg (x) from x, then multiply that result by itself (otherwise known as determining the square of that value). Sum up all those squared values. Then divide that result by (n-1). Got it? Then, there's one more step... find the square root of that last number. That's the standard deviation of your set of data.

Viper GTS

 

[Haircut]

Bah, standard deviation isn't math

 

[Ameesh]

<< Bah, standard deviation isn't math >>



its statistics and we all know statistics is really probability and probabbility is just a bunch of lies so standard deviatiion is lies

 

[Looney]

Hm, not too sure how to type it out here.. but the standard deviation is the square root of the variance (if you know what that is).

 

[Looney]

Here's a link to it

 

[Danlz]

Graphically - it's that point where the Gaussian Distribution Curve changes direction (two places), upslope and downslope.

 

[Looney]

Which Greek symbol are you having a problem with? The one that looks like an M but sideways? That's the sigma symbol, and it means summation.