The average annual return over the period 1926-2009 for small stocks is 21.2%, and the standard deviation of returns is 21.2%. Based on these numbers, what is a 95% confidence interval for 2010 returns?
A) -10.6%, 31.8%
B) 0%, 42.4%
C) -21.2%, 42.4%
D) -21.2%, 63.6%
Answer: D
Business
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