Prove that sum that :
Sum ( i=1 to N) of ( Xi-Xbar)/ N ((X^2)bar - (Xbar)^2) = 0
I know this is something simple like putting everything in terms of Xi/N and cancelling but my brain isn't working today...please help?
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Originally Posted by asq Prove that sum that : Sum ( i=1 to N) of ( Xi-Xbar)/ N ((X^2)bar - (Xbar)^2) = 0 I have a hard time reading the post But this may help.
Yeah, as I said my brain just didn't want to work. I realized that the denominator in that fraction can be factored out (not dependent on i) and then its just very simple to proof that sum Xn-xbar=0.
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