(Yj, Xqj, X2i) satisfy the following assumptions ; in addition, var(u,X1j, X2i) =3 and var (Xi) = 4. A random sample of size n = 397 is drawn from the population. Use the formula below to answer the following questions, 1 Assume that X, and X, are uncorrelated. Compute the variance of B1- The variance of 8, is,

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