Question No-4 7.5 Hatil Furniture has been selling to retail customers in Dhaka for many years. The company advertises extensively on radio. TV. and the lnternet1 emphasizing low prices and easy credit terms. The owner would like to review the relationship between sales and the amount spent on advertising. Below is information on sales and advertising expense for the last four months. Advertising Expense Sales Revenue Month (Tic. million) UK. million] July 2 7 August 1 3 September 3 8 October 4 10 Determine the correlation coefficient and the regression equation