The region of experimentation for three factors are time (40 T1 80 min), temperature (200

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The region of experimentation for three factors are time (40 ≤ T1 ≤ 80 min), temperature (200 ≤ T2 ≤ 300∘C), and pressure (20 ≤ P ≤ 50 psig). A first-order model in coded variables has been fit to yield data from a 23 design. The model is

̂y = 30 + 5x1 + 2.5x2 + 3.5x3 Is the point T1 = 85, T2 = 325, P = 60 on the path of steepest ascent?

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