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###### Why do we write the estimate b1 as Zk;Y ; where(X-X) ki = Z( -X?a. It is easier to prove the biasedness and the minimum variance for b1 using the kj properties: b Use kj properties to prove various properties of the sampling distributions of b1. Use k; to write b1 as a linear combination of Xid. All of the above

Why do we write the estimate b1 as Zk;Y ; where (X-X) ki = Z( -X? a. It is easier to prove the biasedness and the minimum variance for b1 using the kj properties: b Use kj properties to prove various properties of the sampling distributions of b1. Use k; to write b1 as a linear combination of Xi d. All of the above

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