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The average annual retum over the period 1886-2006 for stocks that comprise the S&P 500 is 12%, and the standard deviation of returns is 20%.

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The average annual retum over the period 1886-2006 for stocks that comprise the S&P 500 is 12%, and the standard deviation of returns is 20%. Based on these numbers what is a 95% confidence interval for 2007 returns? A - 13%, 37% OB - 18%, 42% OC -28% 52% OD. -14%, 26%

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