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anonymous

  • one year ago

Suppose the average annual expense for a random sample of 12 stock funds is normally distributed with mean of 1.63 percent with a standard deviation of .31 percent. Calculate a 95 percent confidence interval for the mean annual expense charged by all stock funds.

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  1. kropot72
    • one year ago
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    The confidence interval is found by plugging the given values into the following: \[\large (\bar{x}-1.96\frac{\sigma}{\sqrt{n}},\ \bar{x}+\frac{\sigma}{\sqrt{n})})\]

  2. kropot72
    • one year ago
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    Giving: \[\large CI=(1.63-1.96\frac{0.31}{\sqrt{12}},\ 1.63+1.96\frac{0.31}{\sqrt{12}})=you\ can\ calculate\]

  3. kropot72
    • one year ago
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    @work12345 Are you there?

  4. anonymous
    • one year ago
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    @kropot72 thanks a lot for your help! Sorry about that, I left my computer after waiting awhile on this question.

  5. kropot72
    • one year ago
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    You're welcome :)

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