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Question : The following table shows the annual returns (


The following table shows the annual returns (in percent) for the Vanguard Energy Fund from 2005 through 2009.

Year ……………………………………………………………………………………………… Energy
2005 ……………………………………………………………………………………………… 44.60
2006 ……………………………………………………………………………………………… 19.68
2007 ……………………………………………………………………………………………… 37.00
2008 ……………………………………………………………………………………………… −42.87
2009 ……………………………………………………………………………………………… 38.36

Source: www.finance.yahoo.com.
Construct the 95% confidence interval for the standard deviation of returns. Assume that returns are normally distributed.