[GingerSue]

this is a question about analyzing data - measures of variability - specifically "variance" - it means dispersion and is equal to the square of the standard deviation

what is "equal to the square of the standard deviation" - is it saying the square root of SD, or is it saying SD squared?

a little more clearly than "dispersion" - what does variance really mean?
thanks

[mshultz]

Originally Posted by GingerSue

this is a question about analyzing data - measures of variability - specifically "variance" - it means dispersion and is equal to the square of the standard deviation

what is "equal to the square of the standard deviation" - is it saying the square root of SD, or is it saying SD squared?

a little more clearly than "dispersion" - what does variance really mean?
thanks

Here is an understandable explanation:
http://www.mathsisfun.com/standard-deviation.html

Equal to the square of the standard deviation means:
standard deviation times standard deviation equals variance
or
the square root of variance equals standard deviation

[GingerSue]

Originally Posted by mshultz

Here is an understandable explanation:
http://www.mathsisfun.com/standard-deviation.html

Equal to the square of the standard deviation means:
standard deviation times standard deviation equals variance
or
the square root of variance equals standard deviation

thanks,

this is going to take a bit more time to figure out:

"The Variance (which is the square of the standard deviation, ie: σ2)"

But my book says that standard deviation is SD, not the symbol above - give this a bit of time for me to sort through