Econometrics help please?

Econometrics help please?




Provide brief, but complete, answers to the following questions.

(i) OLS estimates of the slope are more precisely estimated if the X-values are closer to their sample means.



(ii) If Xt and ut are correlated, OLS estimators are still unbiased.



(iii) How does one determine whether a group of explanatory variables exerts a significant influence on the dependent variable?





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