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Dse 2005 doubt

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Ansh malhotra

Jun 15, 2016; 3:36pm

Dse 2005 doubt

91 posts

Ansh malhotra

Jun 15, 2016; 4:09pm

Re: Dse 2005 doubt

91 posts

What is the intuition behind such questions please help

knowpraveen

Jun 16, 2016; 1:35am

Re: Dse 2005 doubt

182 posts

In reply to this post by Ansh malhotra

r^2= [cov(U,V)]^2/var(U)var(V)

cov(U,V)=0+var(Y)+0 since co-efficients of X and Y are zero.

And, var(U)=var(X)+var(Y) since X and Y are uncorrelated (so, Rxy=0)
Same for var(V).

Therefore, r^2 = (var Y)^2/(varX+varY)(varY+varZ)

= 144*144/(165)(225)

Therefore, r=48/65