The average annual return over the period 1926-2009 for the S&P 500 is 12.8%, and the standard deviation of returns is 21.4%. Based on these numbers, what is a 67% confidence interval for 2010 returns?
A) -1.3%, 20.5%
B) -8.6%, 34.2%
C) -25.8%, 54.7%
D) -25.8%, 47.9%
Answer: B
Business
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