The following table shows the annual returns (in percent) for Fidelity's Electronics and Utilities funds. Year Electronics

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The following table shows the annual returns (in percent) for Fidelity's Electronics and Utilities funds.
Year Electronics Utilities
2010................17........................11
2011................-8........................13
2012..................4..........................7
2013................39........................21
2014................38........................22
Source: finance.yahoo.com, data retrieved April 3, 2015.
a. Derive 99% confidence intervals for the mean return for Fidelity's Electronics and Utilities funds.
b. What did you have to assume to make the above inferences?
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