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Perform the following: a) What is the utility of residual plot ? what are its disadvantages ?

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Perform the following:
a)  What is the utility of residual plot ? what are its disadvantages ?
b)  Given Equations of two lines of regression are : 4x+ 3y+ 7 = 0 and 3x+4y + 8 = 0 . Find: 
(i) mean of x and mean of y 
(ii) Regression coefficient of b yx, and bxy
(iii) Correlation coefficient between x and y 


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