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 = β0 + β1x1 + β2x2 + ε .
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.