Statistics equation help

  • Thread starter DavidLiew
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  • #1
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If Var(Y)=[tex]\sigma^2[/tex], then Var ( Y2 ) = ?
 
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Answers and Replies

  • #2
statdad
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[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).
 
  • #3
mathman
Science Advisor
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[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).
should be
[tex] vary(Y^2) = E(Y^4) - (E(Y^2))^2
[/tex]
 
  • #4
statdad
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Crap - yes, mathman is correct. Time to stop posting for a while.
 

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