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Math Help - How to find zα/2 values for confidence interval

  1. #1
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    Feb 2011
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    How to find zα/2 values for confidence interval

    Suppose we have a large sample of n = 400, we happen to know σ, and we use
    mean + 1.43(stnd. dev./square root of n)
    to obtain a confidence interval for μ.

    What is the appropriate zα/2 value for a 45.8% confidence interval?

    This question is causing me problems as I am just not really sure where to start with it.
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  2. #2
    Senior Member
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    Nov 2010
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    Hong Kong
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    Start with the distribution for \mu, and the meaning of z?
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