1. Give an informal argument for consistency of 7/p. Derive the asymptotic distribution of TMD- 2. Find the optimal choice for the weight matrix W and suggest its consistent estimator. 3. Develop a specification test, Le. of the hypothesis Ho : 3yo such that Go = s(70). 4. Apply parts 1-3 to the following problem. Suppose that we have an autoregression of order 2 without a constant term: (1 - PL)-y = Et, where |p