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The average annual retum over the period 1926-2009 for the S&P 500 is 11.8%, and...

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The average annual retum over the period 1926-2009 for the S&P 500 is 11.8%, and the standard deviation of returns is 20.6%. Based on these numbers, what is a 67% confidence interval for 2010 returna? OA-9%, 322% OB-27% 51 5% OC -27% 45.1% OD. -14%, 19.3%

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