The following data gives the amounts of advertising budgets and annual sales. Advertising (thousands S) (X) 45 52 46 48 50 47 53 49 51 Sales (millions $) (Y) 9.5 11 9.7 9.8 10 9.7 11 9.9 10 a) Calculate the linear coefficient of correlation. Interpret. b) Find the equation of the regression line. c) Calculate the residual for Y =9.9

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