Shown below are the sales revenue and advertising cost data for seven companies published by International Advertising Age. COMPANY ADVERTISING ($ MILLIONS) SALES ($ BILLIONS)
Wal-Mart 1,073 351.1
Ford Motor 2,577 160.1
Airbus 4,898 68.2
Reuters Group 2,822 93.2
ATT 3,345 63.1
Fujifilm 829 91.7
Toyota 3,296 207.3
Use the above data to develop a regression line to predict the amount of advertising by sales. Compute the ‘r2' from the regression output.