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Q2. The bivariate regression and covariation: In regression model the variable y is regressed on the variable x with resulting regression line a+bx. Reversing the role of the two variables , x can be regressed on y with the resulting regression line c+dy. a) Derive formulas for the least squares estimates of c and d obtained by regressing x on y. b) Show that bd=R', where b is the conventional least squares estimator and d the slope estimator in a