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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 30%.

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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 30%. Based on these numbers what is a 95% confidence interval for 2007 returns

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