Consider the two (excess retum) index-model regression results for stocks A and B. The risk-free rate over the period was 8%, and the markets suerage 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 intermedliate calculations. Pound your answers to 4 decimal ptuces: b. Which stock is the best choice under the following circumstances