This Question: 1 pt 24 of 45 (42 complete) This Test: 45 pts possible The average annual return over the period 1886-2006 for stocks that comprise the S&P 500 is 9.5%, and the standard deviation of returns is 16%. Based on these numbers what is a 95% confidence interval for 2007 returns? OA. -12.5% 315% OB.-7.5%, 26.5% OC.-22.5% 415% OD. - 11.25%, 20.75% Click to select your