Consider the two (excess retum) index-model regression results for stocks A and B. The risk-free rate over the period was 6%, and the market's average return was 15%. Performance is measured using an index model regression on excess returns. Required: a. Calculate the following statistics for each stock: (Do not round intermediate calculations. Round your answers to 4 decimal places.) b. Which stock is the best choice under the following circumstances? 1. This is the only risky asset to be held by the investor. 11. This stock witl be mbed with the rest of the investor's portfolio, currently composed solely of holdings in the marketindex fund. 6i. This is one of many stocks that the investor is analyaing to form an actively managod stock portfolio