Bars of soap are scored for their appearance in a manufacturing operation. These scores are on a 1-10 scale, and the higher the score the better. Solve the following question and show your process.

C. Bars of soap are scored for their appearance in a manufacturing operation. These scores are on a 1-10 scale, and the higher the score the better. The difference between operator performance and the speed of the manufacturing line is believed to measurably affect the quality of the appearance. The following data were collected on this problem: Appearance Operator Line Speed (Sum for 30 Bars) WWWNNN- - - 150 255 175 246 200 249 150 260 175 223 200 231 150 265 175 247 200 256 EXERCISES FOR CHAPTER 14 319 Requirements 1. Using dummy variables, fit a multiple regression model to these data. 2. Using a - 0.05, determine whether operator differences are important in bar appearance. Using the regression model, demonstrate that the average appearance score for operator No. 1 is 250, operator No. 2 is 238, and operator No. 3 is 256. 3. Does line speed affect appearance? (Use a = 0.05.) 4. What model would you use to predict bar appearance