Question two Consider the following model Y =ax, +4 : 1=12_.T where Equ,)=0,E(4)=o'X; and Eluu, )=0 if sat for all s,t= 12...., T. The values of X

COMMENTS: kindly asking for some guidelines on how to solve the weighted least squares and derive the Variance of a Heteroschedastic model

Question twoConsider the following modelY =ax, +4 : 1=12_.Twhere Equ,)=0,E(4)=o'X; and Eluu, )=0 if sat for all s,t= 12...., T. The values of X arefixed in repeated samples(n) Derive the weighted least squares (WLS) estimator a of a, and also derive thevorion:co of ox(by Is the WLS estimator of a consistent? Explain your answer.(8 marks)