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EXERCISE 5 The sample covariance is given by cov(x, y) = =(-2)(y1-9) n-1 . Expand this formula to show that 1 n n cov (T,

EXERCISE 5 The sample covariance is given by cov(x, y) = =(-2)(y1-9) n-1 . Expand this formula to show that 1 n n cov (T, y) = n - 1 n i=1

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