True or False   Consider the following model, Yi = β0 + β1Xi + ui,E[ui|Xi] = 0,i = 1,...,n (1)Cov(Xi,ui) = 0.  (2) Cov(Yi,ui) = 0. (3) ∑ni=1 ˆuiXi = 0  (4) ∑ni=1 ˆui = 0, where ˆui = Yi − ˆβ0 − ˆβ1Xi

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