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If x and y are uncorrelated variables an...

If x and y are uncorrelated variables and if U=x+y and V=x-y, then e(u,v) is equal to

A

`(sigma x^(2)+sigma^(2))/(sigma x^(2)-sigmay^(2))`

B

`(sigma x^(2)-sigma y^(2))/(sigma x^(2)+sigma y^(2))`

C

`(sigma x^(2)+sigma y^(2))/(sigma x sigma y)`

D

`(sigma x sigma y)/(sigma x^(2)+sigma y^(2))`

Text Solution

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The correct Answer is:
B
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FIITJEE-STATISTICS-Assignment Problems (Objective) Level II
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  6. For a frequency distribution standard deviation is computed by

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  11. Which of the following is true?

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  12. Which of the following is not possible

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  13. If ui=axi+b and vi =cyi+d then

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  14. If yi=axi+b for each i=1,2,3,........n, then

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