12.2 The following data are given for the educational qualification (year of schooling) (x) of a person and the corresponding yearly income (in lac) (y) X y 5 13.6 15.6 10 18.7 12 20.8 16 25.2 18 29.5 a. Compute correlation coefficient. b. Do you think that yearly income increases significantly with the increase of year of schooling? c. Fit a regression line of y on x. d. Estimate the yearly income of an illiterate person. e. Test the significance of regression