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Math Help - Statistical modeling

  1. #1
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    Statistical modeling

    If Xis are distributed with mean (mui) and standard deviation (sigma),
    and if all the possible samples of size n are drawn from this population

    what is
    the mean and standard deviation of the sample mean x bar?
    the distribution of the sample mean x bar as n increases?
    the distribution of the sample mean if x bar is itself normal?
    Last edited by yus2k; March 14th 2010 at 07:42 AM.
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  2. #2
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    Sampling Distributions

    the mean and standard deviation of the sample mean x bar?
    depends on your sample, it may not be very similar to population

    the distribution of the sample mean x bar as n increases?
    if n is sufficiently large then,
    we can assume x bar~N(mean, (sigma^2)/n)

    the distribution of the sample mean if x bar is itself normal?[/quote]
    N(mean, (sigma^2)/n)
    that is because small samples has increased variability
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  3. #3
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    Quote Originally Posted by rubic View Post
    the mean and standard deviation of the sample mean x bar?
    depends on your sample, it may not be very similar to population
    yea im still very confused about this isnt it just the formula for mean and standard deviation

    but i dont understand what it means to find mean and standard dev of x(bar)
    thnx for the other two tey make sense
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