plz help DSE 2016 ques

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plz help DSE 2016 ques

Rajesh
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Re: plz help DSE 2016 ques

Rajesh
i am getting ans as Var(Z)= 2. Var(X^2)..
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Re: plz help DSE 2016 ques

Rajesh
Anyone please?
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Re: plz help DSE 2016 ques

Halflife
When Y=-1, Z=-2X therefore Var(Z)=4Var(X)
When Y=1,  Z=2X therefore Var(Z)=4Var(X)
{as Var(ax)=(a^2)Var(x)}
So Var(Z)>Var(X)
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Re: plz help DSE 2016 ques

Rajesh
ohkk, i was just making such an easy ques. too tricky..thankyou Halflife:)
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Re: plz help DSE 2016 ques

Halflife
This question had made me uncomfortable too. Seems tough but is easy.
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