Question: Show that MSE (the mean squared error proposition from earlier in this section). Write for Expand the two quadratic expressions, and use the variance

Show that MSE  () = E[( 0)] = V() + [E() 0] (the mean squared error proposition from earlier in this section). 

Write μ for Expand the two quadratic expressions, and use the variance shortcut formula to rewrite

() = E[( 0)] = V() + [E() 0]

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