# Statistics equation help

If Var(Y)=$$\sigma^2$$, then Var ( Y2 ) = ?

Last edited:

Homework Helper

$$vary(Y^2) = E(Y^4) - E(Y^2)$$

(same basic patten for the random variable $$Y^2$$ as for any other random variable).

mathman

$$vary(Y^2) = E(Y^4) - E(Y^2)$$

(same basic patten for the random variable $$Y^2$$ as for any other random variable).
should be
$$vary(Y^2) = E(Y^4) - (E(Y^2))^2$$