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the average annual return over the period 1886-2006 for stocks that comprise of the S and P 500 is 10% and the standard deviations of
the average annual return over the period 1886-2006 for stocks that comprise of the S and P 500 is 10% and the standard deviations of returns is 20%. Based on these numbers, what is a 95% confidence interval for 2007 returns
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