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Math Help - confidence intervals fir the population mean u

  1. #1
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    confidence intervals fir the population mean u

    Hello I'm having trouble with this problem below. What i need to do is find the indicated confidence interval for the population mean u. Can anyone help me please.

    c=.95, x=31.39, s=.8, n=82

    Thanks for the help in advance.
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  2. #2
    Eater of Worlds
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    There'snot much to a CI. The formula is E=z\cdot \frac{\sigma}{\sqrt{n}}

    You have {\sigma} and n, plug them in. The z score for a 95% is 1.96.

    Find that value, then add and subtract it from the mean. That's it.

    You should get E=about .17 if you do it right.
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  3. #3
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    ok thank you very much that makes alot more sense.
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