Question 8. Compute the slope and intercept constant using the regression line equations. How much spray time would you allow for a new part with a surface area of 250 square inches?

8. The analyst in the Dorben Company made 10 independent time studies in the hand paint spraying section of the finishing department. The product line under study revealed a direct relation between spraying time and product surface area. The following data were collected: Standard time Study no. 1 2 3 4 Rating factor 0.95 1.00 1.05 0.80 1.20 1.00 0.85 0.90 1.00 1.10 Product surface area 170 12 150 41 130 50 120 70 105 95 0.32 0.11 0.31 0.14 0.27 0.18 0.24 0.23 0.25 0.22 7 8 9 10 Compute the slope and intercept constant, using regression line equations. How much spray time would you allow for a new part with a surface area of 250 square inches