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4. Consider the regression model Y = Bo + 1X, + up. Suppose that the estimated OLS regression line is Y =9.72 (there is no mistake in this equation). Which of the following is definitely true? O There is insufficient variation in the variable X O None of the other options is correct O For every i, u, = 0 O For every i, di = 0 O The regression R2 is zero O B would be estimated imprecisely 5. Consider the regression model Y = Bo + 1X; + uj. Suppose that least squares assumptions 2 and 3 are satisfied. However, E(u;|X; = x) = 75X;. Which of the following is true? O the OLS estimator B is now a consistent estimator of By O the OLS estimator S, is now a consistent estimator of By O the OLS estimator & is now an unbiased estimator of B - 75 O the OLS estimator & is now an unbiased estimator of B + 75 O None of the other options are true