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Math Help - confidence intervals

  1. #1
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    confidence intervals

    A random variable X has poisson distribution with parameter u(greek letter mu). A sample of 200 observations from this distribution has a mean equal to 3.4. Construct an approximate 90% confidence interval for u.
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    Quote Originally Posted by zami View Post
    A random variable X has poisson distribution with parameter u(greek letter mu). A sample of 200 observations from this distribution has a mean equal to 3.4. Construct an approximate 90% confidence interval for u.
    Please post your work so far, we can help from there.
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  3. #3
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    I"m not sure how to construct an interval for a Poisson distribution.
    so far i have

    p(x)= (^x e(-))/x! with =3.4 also the z value at 90% is 1.282

    Where do I go from there?
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