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Math Help - I need a few equations that I can't find...

  1. #1
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    I need a few equations that I can't find...

    Hi
    Just wanted to ask people if they could help me find a few equations I am looking for; I am revising for a test and the teacher said that a few of these may come up, so you must remember them. However, I can't find these particular formulae, so I was wondering if anyone could point me in the right direction or just help me!

    I cant find: the unbiased estimator of population variance- is this just sample variance?
    The equation for linear combination of variables: mean and the one for variance

    and finally, the test statistic for hypothesis test, beta=o and the test statistic for population proportion. I would be really grateful if someone either knew these formulae or knows where I could find them...

    Thanks
    Last edited by Noshrunner; January 13th 2012 at 06:53 AM. Reason: A few spelling mistakes...
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  2. #2
    MHF Contributor matheagle's Avatar
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    Re: I need a few equations that I can't find...

    the sample variance, with the n-1 in the demoninator is unbiased for \sigma^2
    That's why the n-1 is there.
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  3. #3
    MHF Contributor matheagle's Avatar
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    Re: I need a few equations that I can't find...

    I don't know what you mean by
    'The equation for linear combination of variables: mean and the one for variance'

    and as for beta=0, it seems you're doing regression
    SO I clearly need to know the model that you are proposing.
    Most likely it's simple linear regression.
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