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.

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?

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Study No. Product surface area Standard time Rating 170 0.95 0.32 0.11 1.00 12 0.31 3 1.05 160 0.14 0.80 41 5 1.20 130 0.27 0.18 1.00 50 120 0.85 0.24 0.90 70 0.23 1.00 105 0.25 1.10 10 95 0.22