Question: The average return for the SThe average return for the S The average return for the S&P 5 0 0 from 1 8 8 6

The average return for the SThe average return for the S
The average return for the S&P 500 from 1886 to 2006 is 5%, with a standard deviation of 15%. Based on these numbers, what is a 95% confidence interval for 2007 returns?
a.-25%,35%
b.-12.5%,17.5%
c.-25%,25%
d.-15,25%
The average return for the SThe average return

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