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Answer the following questions in short: Following are two regression lines : `3x - 5y= 1` and `4x - 7y = 3` Find `barx`, `bary` and correlation coefficient r.

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Answer the following questions in short: Following are two regression lines : 3x - 5y= 1 and 4x - 7y = 3 Identify which one is regression equation of x on y and which one is of y on x.

Answer the following questions (Alternatives are to be noted): If V(x) = 9, V(y) = 4 and V(x - y) = V(x), find the correlation coefficient between x & y.

Answer the following questions in short: If three uncorrelated variables x_1, x_2, x_3 have the same standard deviation, find the correlation coefficient between x_1 + x_2 and x_2 + x_3 .

Answer the following questions (Alternatives are to be noted): If the relation between two variables x and y is y = 2x + 3 , find the correlation coefficient between x and y.

Answer the following questions in short: If the correlation coefficient between x and y is 0.5, find the correlation coefficient between 5x and -4y.

Answer the following questions (Alternatives are to be noted): If two lines of regression are given by 2x + 3y = 13 and 3x + 4y = 18, find the sum of A. M. s of x and y.

Answer the following questions in short: Prove that regression coefficients do not depend on change of origin but depend on change of scale.

Answer the following questions in short: Define Spearman's Rank-correlation coefficient and drive, it when there are no, ties.

Answer the following questions (Alternatives are to be noted): If u = 2x + 5 and v = - 3y + 1 and regression coefficient of y on x is-12, determine the regression coefficient of v on u.

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