The average annual return over the period 1886-2006 for stocks that comprise the S&P 500 is 10%, and the standard deviation of returns is 20%. Based on these numbers, what is a 95% confidence interval for 2007 returns? A-30% 50% OB.-30%, 40% c.-15%, 25% OD -20%, 40% Carbondale Oil announces that a wildcat well that it has sunk in a new oil province has shown the existence of substantial oil reserves. The exploitation of these reserves is expected to Increase Carbondale's free cash flow by 500 million per year for eight years. If investors had not been expecting this news what is the most likely effect on Carbondale's stock price upon the announcement, given that Carbondale has 60 milion shares outstanding, no debl, and an equity cost of capital of 9%? O A rise by $8.30 OB. Tie by $9.96 O Crise by 56.64 OD. to effect