6_ Consider the regression model: YE =3u+ui This is the usual regression model seen in class.The only difference is that we have excluded the term 1313p An alternative way of expressing the OLS estimator of u is: 1 n 2 in i=1 None of'the other options are correct 7. You postulate a linear relationship between two variables, X and Y of the form: Yi = Bo + B1Xi + ui where u; denotes all other factors apart from X, affecting the value of Y for observation i. Consider E((X; - Hx)2(pu;)2), where ux denotes the mean of X and p is a constant. Here, pu; is obtained by multiplying the constant p with up. Suppose that LSA #1 is satisfied so that E(u;|X,) = 0, and suppose Gu denotes the population standard deviation of u and Ox denotes the population standard deviation of X, and n denotes the number of observations, then E((X; - Hx)2(pu;)2) is equal to: pozox O 620x Onpolox O None of the other options are correct