Question: 1. The sample covariance between X and Y is defined as follows: n cov (Y, 50 Prove that this is identical to the following

$1. The sample covariance between ( X ) and ( Y ) is defined as follows: [ operatorname{cov}left(Y_{i}, X_{i}ight)=f$

1. The sample covariance between X and Y is defined as follows: n cov (Y, 50 Prove that this is identical to the following alternative specification: n cov(Y, X;) =____X,Y, __"_XY X.Y.. i=1 n-1 X,)=(X-X)-) n-1 i=1 1 n-

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