2) Using the rules of the summation operator, derive each part of equation A.8. means you have to show that: That E[(x; – x)(y; – ỹ))=Ex;(y; – ÿ) i=1 i=1 Σ(x-X)y; i=1 and E[x;yi] – n(xy) and i=1 Be sure to show each step so I can see how you rearranged and combined terms. sWI

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