7. The analyst in the Dorben Company made 10 independent time studies in the hand 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. Study No. 1 2 4 5 6 8 9 10 Surface Area 170 12 41 130 50 70 105 95 (sq. inches) Standard Time (hours) 3 150 0.31 0.14 0.11 0.32 0.27 0.18 7 120 0.24 0.23 0.25 (7a) Compute the slope and intercept constant using regression line equations. (7b) What is the correlation coefficient? (7c) How much spray time would you allow for a new part with a surface area of 250 sq. inches? 0.22

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