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If n = 5,sumx = sumy = 20, sumx^2 = sumy...

If `n = 5,sumx = sumy = 20, sumx^2 = sumy^2 = 90 , sumxy = 76`
Find
Covariance (x,y)

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The correct Answer is:
`-0.8`
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In a blvariate data sum x=30, sumy=400, sumx^(2)=196, sumxy=850 and n=10 . Find the regression coefficient of y on x.

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NAVNEET PUBLICATION - MAHARASHTRA BOARD-QUESTION BANK 2021-Part II 3. LINEAR REGRESSION (II State whether the following statements are true or false:)
  1. State True or False: The equations of two regression lines are 10x-4y=...

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  2. State True or False: y = 5 + 2.8x and x = 3 + 0.5y be the regression l...

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  3. State true or false: Both the regression coefficients cannot exceed 1

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  4. State True or False: If b(yx)=1.5 and b(xy)=1/3 then r = 1/2. The give...

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  5. Correlation analysis is the theory of games. (True/False)

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  6. State True or False: If b(xy) lt 0 and b(yx) lt 0 then ‘r’ is gt0

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  7. State True or False: The following data is not consistent: byx+ bxy =...

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  8. State True or False: If u=x-a and v= y-b then b(xy)= b(uv).

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  9. State True or False: If equation of regression lines are 3x+2y-26=0 an...

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  10. State True or False b(xy) is the slope of regression line of y on x.

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  11. State True or False: corr(x,x) = 0

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  12. State True or False: corr(x,x)=1

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  13. State True or False: cov(x,x)= variance of x

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  14. Regression analysis is used for measuring the degree of the relationsh...

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  15. State True or False: Regression coefficient of x on y is the slope of ...

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  16. The variable used for predicting the response is called the independen...

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  17. If n = 5,sumx = sumy = 20, sumx^2 = sumy^2 = 90 , sumxy = 76 Find ...

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