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4. Suppose x = Li=1 x; and y = = Et=1yi. (a) Show that Et-1 (xi - x) (yi - y) = Er xiyi -

4. Suppose x = Li=1 x; and y = = Et=1yi. (a) Show that Et-1 (xi - x) (yi - y) = Er xiyi - nxy. (b) Show that Et, (xi - x) is always equal to 0

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