(True/False) Identify whether the following statements are true or false and present why you believe so. (a) The normality assumption of the regression error can be informally tested by examining the normality of the dependent variable (b) Homoskedasticity is required to show the unbiasedness of the OLS estimators. (c) When a relevant regressor that is correlated with the variable of interest is omitted, the zero conditional mean independence assumption is violated. (d) When the zero conditional mean independence assumption fails to hold in a regression, the OLS estimators are biased. (e) The multicollinearity problem can be mitigated by increasing the sample size. Discuss this by referring to V ar(b j ) and V ar(b j ): In answering this question, specify the symptom of the multicollinearity problem (that is, by observing what, do you conclude that there may be a multicollinearity problem?).