4. Show that Cov(B, y - X3) = 05. Consider the following regression model Y =1,B+c where 1, denotes an n-dimensional vector of 1's. Compute
4. Show that Cov(B, y - X3) = 05. Consider the following regression model Y =1,B+c where 1, denotes an n-dimensional vector of 1's. Compute the least squares estimator of 3 and compute the corresponding hat matrix H
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