Question: 4. (10) Write the expression for the variance of the least squares estimator of i (the coefficient of x) in the multiple linear regression

4. (10) Write the expression for the variance of the least squares

4. (10) Write the expression for the variance of the least squares estimator of i (the coefficient of x) in the multiple linear regression model. [Assume there are k slope coefficients in the model.] Be sure to define all terms in the equation. (05) a. How in practice would you estimate the variance of the least squares estimator of Bi? (05) b. Suppose that a regression of X on X2, X3, X yields an R of 0.95. What does this imply about the precision with which i can be estimated, compared with the case in which the R = 0.30?

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