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Statistics equation help

  1. Aug 21, 2010 #1
    If Var(Y)=[tex]\sigma^2[/tex], then Var ( Y2 ) = ?
     
    Last edited: Aug 21, 2010
  2. jcsd
  3. Aug 21, 2010 #2

    statdad

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    Re: Statistics

    [tex] vary(Y^2) = E(Y^4) - E(Y^2)
    [/tex]

    (same basic patten for the random variable [tex] Y^2 [/tex] as for any other random variable).
     
  4. Aug 21, 2010 #3

    mathman

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    Re: Statistics

    should be
    [tex] vary(Y^2) = E(Y^4) - (E(Y^2))^2
    [/tex]
     
  5. Aug 21, 2010 #4

    statdad

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    Re: Statistics

    Crap - yes, mathman is correct. Time to stop posting for a while.
     
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