QUESTION B2 (25 Marks) The marketing manager of a large supermarket chain would like to use shelf space (x in feet) to predict the sales (y in $) of pet food. The data of a selected random sample of 12 stores was summarized as follows: Ex=195 y = 2850 Exy = 51170 Ex? = 4283 y? = 706900 Note: Express all answers in three decimal places. Use the above information, calculate the product moment correlation, r and interpret your answer. (7 marks) Calculate the coefficient of determination, r and interpret your answer. (5 marks) (c) Write down the linear regression equation in the form of y = a + bx . (10 marks) (d) By using the regression equation in part (c), predict the sales of pet food for stores with 8 feet of shelf space. (3 marks) (b)