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Question 3 Provide brief, but complete, answers to the following questions. (i) Explain the properties of the regression line as chosen by the OLS method?

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Question 3 Provide brief, but complete, answers to the following questions. (i) Explain the properties of the regression line as chosen by the OLS method? (ii) Prove that Sum(e_ iY-hat i)=0 that is, the sum of the product of the residuals e i and the estimated YIi is always zero

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