Question: In the model y=Bix + B2x2 + B3x31+ the coefficients are known to be related to a more basic economic parameter a according to the

In the model y=Bix + B2x2 + B3x31+ the coefficients are known to be related to a more basic economic parameter a according to the equations B+ B = B+ B = - Assuming that the xs are nonrandom and that u,~ IN(0, 2), find the best unbiased linear estimator & of a and the variance of &.

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