• • 4.53 Using the date in Problem 4.47, the company wants to find out how closely sales are related to the money spent on advertisements.

a) Calculate the coefficient of correlation for the data given in Problem 4.47 and comment on the degree of the linear relationship.

b) If the correlation coefficient was the same but negative, what would it tell you?

c) List some advantages and disadvantages of the correlation coefficient.

d) Calculate the model’s coefficient of determination.

e) Identify the differences between correlation coefficient and coefficient of determination. How are they similar and how are they different? Explain the differences in the organizational objectives they are trying to achieve.