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Thank you teacher 2. Let the model be: Y = Bo+ BIXa + B2X12 + ut; t = 1,2, . .., T E(ut) = 0

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2. Let the model be: Y = Bo+ BIXa + B2X12 + ut; t = 1,2, . .., T E(ut) = 0 for all t. A researcher suspects that the variance of the disturbance term is Var(u,) = o'Xa. (a) Explain how the researcher should proceed to test the null hypothesis Ho : Var(u,) = 0' against the alternative hypothesis H, : Var(u,) = 0? Xu. (7 marks)

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