Question: Consider the least - squares residuals e yy i ii = , i = 1, 2, . . . , n , from

Consider the least - squares residuals e yy i ii = − ˆ , i = 1, 2, . . . , n , from the simple linear regression model. Find the variance of the residuals Var( e i ). Is the variance of the residuals a constant? Discuss.

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