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Which of the following is a requirement for a series to be i.i.d? of estion O a. Random process O b. Mean independent of time O c. Strong dependence O d. Weak dependence Suppose the true model of interest is represented by y, = Bo + BIX + ByXzi + u, . where Kit and X21 are correlated and E(U, (X,, X2;) = 0 and Vartu, (x1;. X2) # Gu, What would you expect to be associated with the multivariate regression of ), on X1, and X2: ? out of yestion O a. Inflated and invalid standard errors O b. Inflated variances O c. Biased coefficients O:d. No problems found influence the price of a particular good. Calculate the standard error for the variable 'qual