Understanding R Squared Regression for Josh

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http://imgur.com/LAOgGyY
http://imgur.com/LAOgGyY

I know the components of R2 as in ESS, TSS, RSS.
I know cov(x,y) = [\sum(yi - ybar)(xi - xbar)]/n-1

But that's as far as I can go, I have come across lowercase r yet or the sample correlation and proofing how they all fit is a bit beyond me so if someone can provide some help that would be great thanks.

This is not homework.

Josh
 
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Sorry about that. Didn't come up in the test so I am all good.
 

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