a. Plot the data with impressions on the vertical axis and advertising expenditure on the horizontal axis. What kind of relationship do you observe?
b. Would it be appropriate to fit a bivariate linear regression model to the data? Why or why not? If not, what type of regression model will you fit the data to? Do we have the necessary tools to fit such a model?
c. Suppose you do not plot the data and simply fit the bivariate regression model to the data. Obtain the usual regression output. Save the results for a later look at this problem.