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Math Help - Confidence interval

  1. #1
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    Confidence interval

    a sample of 10 observations is taken from a normal population for which the population standard deviation is known to be 5. the sample mean is 20.
    find the 95% confidence interval for the population mean
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  2. #2
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    Quote Originally Posted by gogothesaint View Post
    a sample of 10 observations is taken from a normal population for which the population standard deviation is known to be 5. the sample mean is 20.
    find the 95% confidence interval for the population mean
    You will find several worked examples on MHF. Where are you stuck?
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