9. CGL of MXY Engineering Services believes that his firm's engineering services contracted to construction firms are directly related to the volume of business contracts with companies in the region. He also believes that this fact will really help him plan his operations better by forecasting the engineering services required by construction firms. Given the following data, (a) develop a regression equation for predicting the level of demand of MXY services and (b) determine the coefficient of correlation and standard error of estimate to prove that a linear relationship does exist: Quantity 1 2 3 4 5 6 7 8 Sales of MXY Services 8 10 15 9 12 13 12 (in $ thousands) 112 16 Contracts Released 153 172 197 178 185 199 205 226 (in $ thousands)