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 : (Alternatives are to be noted): If r_(xy) = 0.8 , find r_(uv) where u = x+5 , v = 3 - y .

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 (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 (Alternatives are to be noted): If x and y are two independent negative random variables with E(xy) = 6 and EIXI= 3, then find E(y).

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.

Answer the following questions (Alternatives are to be noted): If x and y are both are negative random variables, mutually independent, E(xy) = 6 and |E(x)| = 2 , find E(Y) .

Answer the following questions (Alternatives are to be noted): In a partially destroyed laboratory record of an analysis of correla tion data, the following results only are legible : V(x) = 9, Regressio equations : 8x - 10y + 66 = 0 and 40 x - 18y = 214 . Find the standard deviation of y.

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.

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.

Short Questions: Calculate the means of the variables x and y, given the regression lines as x + 6y=8 and 3x + 2y = 10 .