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Question 8 1 p Which of the following are the theoretical consequences of imperfect multicollinearity? O OLS estimators are unbiased O OLS estimators are minimum variance O OLS estimators are not BLUE if some repression coefficients are insignificant O a and b are true O all answers a, b. c are true Question 9 1 p Which of the following are the practical consequences of imperfect multicollinearity? O Large variances and covariances of OLS estimators O Wider confidence intervals O A high R but few significant t ratios O Wrong signs for repression coefficients. O only c and d O a, b, c and d are all correct