Yi , X1i , X2i ) satisfy the assumptions in Key Concept 6.4;
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Yi , X1i , X2i ) satisfy the assumptions in Key Concept 6.4; in addition, var(ui X1i , X2i ) = 4 and var(X1i ) = 6. A r
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Yi , X1i , X2i ) satisfy the assumptions in Key Concept 6.4; in addition, var(ui X1i , X2i ) = 4 and var(X1i ) = 6. A random sample of size n = 400 is drawn from the population. a. Assume that X1 and X2 are uncorrelated. Compute the variance of bn 1. [Hint: Look at Equation (6.17) in Appendix 6.2.] b. Assume that corr(X1, X2) = 0.5. Compute the variance of bn 1. c. Comment on the following statements:
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