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)-15%,25%
B)-20%,40%
C)-30%,50%
D)-30%,40%
E)-10%,30%

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The Answer of 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)-15%,25%
B)-20%,40%
C)-30%,50%
D)-30%,40%
E)-10%,30%

The Average Annual Return Over the Period 1886-2006 for Stocks