Question: Two chemical engineers, A and B, are working independently to develop a model to predict the viscosity of a product (y) from the pH (x1)

Two chemical engineers, A and B, are working independently to develop a model to predict the viscosity of a product (y) from the pH (x1) and the concentration of a certain catalyst (x2). Each engineer has fit the linear model
y = Î²0 + Î²1x1 + Î²2x2 + Îµ
The engineers have sent you output summarizing their results:

The engineers have also sent you the following scatterplots of pH versus concentration, but forgot to put their names on them.

a. Which plot came from which engineer? How do you know?
b. Which engineer's experiment produced the more reliable results? Explain.

Engineer A Predictor Constant Coef 199.2 1.569 -4.730 SE Coef 0.5047 0.4558 0.5857 394.7 -3.44 -8.08 0.000 0.007 0.000 Concent. Engineer B Predicton Constant pH Concent. Coef 199.0 1.256 3.636 SE Coef 0.548 1.983 1.952 363.1 -0.63 0.000 0.544 0.112 pH pH Concentration Concentration 1

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