3. (5 pts) Under Assumption MLR.1-MLR.6 (u ~ N(0, o')), we can construct valid confidence intervals by FGLS estimator. 4. (5 pts) 2SLS always has
3. (5 pts) Under Assumption MLR.1-MLR.6 (u ~ N(0, o')), we can construct valid confidence intervals by FGLS estimator. 4. (5 pts) 2SLS always has a smaller standard error than OLS if Elu(X1, . .., Xx] # 0
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