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The average annual return over the period 1886-2006 for stocks that comprise the S&P 500 is 15%, and the standard deviation of returns is 30%.
The average annual return over the period 1886-2006 for stocks that comprise the S&P 500 is 15%, and the standard deviation of returns is 30%. Based on these numbers what is a 95% confidence interval for 2007 returns?
A.35%,65%
B.30%,60%
C.45%,75%
D.22.5%,37.5%
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