Suppose a business analyst wanted to study the relationship between the annual advertising cost ($million) of a retail company and the number of stores the company owns. She takes a random sample of data, and created the following simple linear regression information: Estimated Advertising cost = 0.8 + 0.1*Number of stores r = 0.9 i) Interpret the slope. ii) Interpret the correlation coefficient. iii) Calculate and interpret the coefficient of determination