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Halflife
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Doubt
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Abhitesh
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Re: Doubt
XY = X if Y=1
= -X if Y=-1.
X/Y = X for any Y.
Now the value of XY will depend on X/Y. If X/Y = x then XY = x or -x with equal probability.
Halflife
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Sachin Sehgal
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Re: Doubt
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by Abhitesh
But why X/Y is X ..I mean it's value should also be x or -x depending upon the value of Y.
Abhitesh
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Re: Doubt
X|Y is the value of X given Y.
The value of X doesn't depend on Y.
Halflife
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Abhitesh
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Re: Doubt
In that case they would be equal.
AdityaGarg13
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Re: Doubt
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by Halflife
I too think so. If it was X given by, it would have been enclosed in bracket.
Other term is product, this one would be division!!!
Halflife
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Re: Doubt
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by Abhitesh
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Halflife
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Re: Doubt
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by AdityaGarg13
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sneha
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Re: Doubt
only if I assume X to be independent ....I'm able to solve the question
otherwise this is getting complicated
Halflife
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sneha
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Re: Doubt
hey,as per what I read cov(x,y)=E(XY)-E(X)E(Y)
and acc to this it will become E(XY.X/Y)-E(XY)*E(X/Y)
Halflife
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Shree
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Re: Doubt
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by Halflife
Cant it be solved like this:
Let y=1
Z=X+X
=2X
V(Z)=4V(X)
Let y=-1
Z=-X-X
=-2X
V(Z)=4V(X)
And in both the cases V(Z)>V(X)
If this is not the correct way then please explain why it isnt..:-)
Halflife
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