Question: 6. (12 points) Suppose that the Single Index Model is valid, and you have the following information on different assets: Asset Historical STD(S) Beta (B)

 6. (12 points) Suppose that the Single Index Model is valid,

6. (12 points) Suppose that the Single Index Model is valid, and you have the following information on different assets: Asset Historical STD(S) Beta (B) Residual average return () variance ole) Portfolio A 23% 40% 0.07 T-bills 4% 0 0 Market index portfolio 15% 20% 1 0 A) Calculate the I? measure for Portfolio A. (6 points) 0 B) Suppose that a portfolio manager follows the Treynor-Black model, and constructs an optimal portfolio (consisting of the market index portfolio and the active portfolio A). What is the Sharpe ratio for the optimal portfolio? (6 points) 6. (12 points) Suppose that the Single Index Model is valid, and you have the following information on different assets: Asset Historical STD(S) Beta (B) Residual average return () variance ole) Portfolio A 23% 40% 0.07 T-bills 4% 0 0 Market index portfolio 15% 20% 1 0 A) Calculate the I? measure for Portfolio A. (6 points) 0 B) Suppose that a portfolio manager follows the Treynor-Black model, and constructs an optimal portfolio (consisting of the market index portfolio and the active portfolio A). What is the Sharpe ratio for the optimal portfolio? (6 points)

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