Use the regression model in part (c) of Problem 6-23 to generate a response surface contour plot of yield. Discuss the practical value of this response surface plot.

Problem 6-23

In a process development study on yield, four factors were studied, each at two levels: time (A), concentration (B), pressure (C), and temperature (D). A single replicate of a 2⁴ design was run, and the resulting data are shown in the following table:

(c) Write down a regression model relating yield to the important process variables.

Transcribed Image Text:

Actual Run Order Factor Levels Run Yield Number A B C D (lbs) Low (-) High (+) 1 5 12 A (h) 2.5 3 18 B (%) 14 18 C (psi) 60 D (C) 225 3 8 13 80 4 13 16 250 5 3 17 7 15 7 14 20 8 1 15 9 6. 10 10 11 25 11 2 13 12 15 + 24 13 4 19 14 16 21 15 10 17 16 12 23 + + + + + + + + + + + + +I + 1 + | + | +