Ford Motor Company had realized returns of 5%, 20%, -20%, and -5% over four quarters. What is the quarterly standard deviation of returns for Ford? A. 20.2% OB. 18.52% O c. 16.83% OD. 15 15% The average annual return over the period 1886-2006 for stocks that comprise the S&P 500 is 8%, and the standard deviation of returns is numbers what is a 95% confidence interval for 2007 returns? OA. -22%, 38% OB. - 16%, 24% OC. -17%, 33% OD. -32%, 48% The average annual return over the period 1886-2006 for stocks that comprise the S&P 500 is 8%, and the standard deviation of returns is 20%. Based on these numbers what is a 95% confidence interval for 2007 returns? OA. -22%, 38% OB. -16%. 24% OC. - 17% 33% OD. -32% 48%