Question: Q 1 ) E [ Y _ i = b _ 1 + ( b _ 2 ) ( X _ i ) + u

Q1) E[Y_i=b_1+(b_2)(X_i)+u_i]=?
Q2) E[((u_i)/(X_i))-E((u_i)/(X_i))]^2=?
Q3)E{[((u_i)/(X_i))-E((u_i)/(X_i))][X_i-E(X_i)]}=?
Q4)Var-Cov(u_i,u_j)=?

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