(i) The following table shows the Mean, the Standard Deviation and the coefficient of correlation of two variables x and y.

Calculate:
(a) the regression coefficient b_xy and b_yx
(b) the probable value of y when x = 20

(ii) An analysed 102 trips of a travel company. He studied the relation between travel expenses (y) and the duration (x) of these trips. He found that the relation between x and y was linear. Given the following data, find the regression equation of y on x.

Solution

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