??????? Let X1?,X2?,X3? be independent random variables with X1??N(1,?),X2??N(?1,?), and X3??N(0,?) Consider the expressions q1?(X)=2X12?+X22?+2X32?+2X1?X2??,q2?(X)=2X12?+X22??2X1?X2?? and q3?(X)=6X12?+X22?+X32?+2X1?X2?+4X1?X3?+4X2?X3??. In homework 8, exercise 4 we showed that ?2q1?(X)???22?. What can we conclude about ?2q2?(X)? and ?2q3?(X)? ? W

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???????  Let X1?,X2?,X3? be independent random variables with X1??N(1,?),X2??N(?1,?), and X3??N(0,?) Consider the expressions q1?(X)=2X12?+X22?+2X32?+2X1?X2??,q2?(X)=2X12?+X22??2X1?X2?? and q3?(X)=6X12?+X22?+X32?+2X1?X2?+4X1?X3?+4X2?X3??. In homework 8, exercise 4 we showed that ?2q1?(X)???22?. What can we conclude about ?2q2?(X)? and ?2q3?(X)? ? Which pairs among q1?(X),q2?(X),q3?(X) are independent?

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