Show that (Sorry about the lack of latex here) [Σ from i=1 to n] of (x[i] - x(bar))^2 = [Σ from i=1 to n] of (x^2[i] - n*x^2(bar)
Last edited by mitch_nufc; March 5th 2009 at 10:48 AM.
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We need to know the definition of the mean: . Show that .
We have: . . . . . . . . . . .
The last sum is: .
Then  becomes: . . . . There!
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