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Is Sxy = (E yi*xi) - (xbar * ybar) the same as E(xi - xbar) -...

Is Sxy = (E yi*xi) - (xbar * ybar) the same as E(xi - xbar) - (yi - ybar)? I am not sure what the second formula is from.  

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Answer #1

We know that,

Sxy=∑(xi*yi)−n*xbar*ybar

Which is also same as

Sxy=Σ(xi−xbar)*(yi−ybar).

Thank you.

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