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Thread: simplifying

  1. September 15th 2009, 04:18 AM #1
    omgimsodumb
    omgimsodumb is offline
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    simplifying

    hi, can someone please explain to me how they got from

    [\frac{s + n(\mu - \overline{Y})^2}{2}]^{-n/2}
    to
    [(1 + \frac{n(\mu - \overline{Y})^2}{s})(\frac{s}{2})]^{-n/2}


    coz i don't get it sorry
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  2. September 15th 2009, 05:18 AM #2
    HallsofIvy
    HallsofIvy is offline
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    Quote Originally Posted by omgimsodumb View Post
    hi, can someone please explain to me how they got from

    [\frac{s + n(\mu - \overline{Y})^2}{2}]^{-n/2}
    to
    [(1 + \frac{n(\mu - \overline{Y})^2}{s})(\frac{s}{2})]^{-n/2}


    coz i don't get it sorry
    Most of that is "clutter". Think of it as \frac{s+ A}{2}. Factor out a "1/2": (s+ A)(\frac{1}{2})= (s+ \frac{As}{s})\frac{1}{2} and now factor out an "s": (1+ \frac{A}{s})\frac{s}{2}.
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