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Math Help - Confidence Intervals for one population mean when stigma is unknown.

  1. #1
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    Confidence Intervals for one population mean when stigma is unknown.

    The question is:

    Two t-curves have degrees of freedom 12 and 20. Which one more closely resembles the standard normal curve? Explain.

    I am thinking that 20 resembles it because of the central limit therom and the fact that t scores spread out much more then z scores. If I am write or wrong, please explain to me in detail what I may be missing.

    Thanks =)
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  2. #2
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    Quote Originally Posted by l0v3n View Post
    The question is:

    Two t-curves have degrees of freedom 12 and 20. Which one more closely resembles the standard normal curve? Explain.

    I am thinking that 20 resembles it because of the central limit therom and the fact that t scores spread out much more then z scores. If I am write or wrong, please explain to me in detail what I may be missing.

    Thanks =)
    The answer is df = 20 t-curve. Think about what the pdf of the t-distribution does in the limit df --> oo.
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