Suppose that in Exercise 14-22 it was possible to run only a 12 fraction of the 2⁴design. Construct the design and use only the data from the eight runs you have generated to perform the analysis.

Exercise 14-22

A 2⁴ factorial design was run in a chemical process. The design factors are A = time, B = concentration, C = pressure, and D = temperature. The response variable is yield. The data follow:

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Factor Levels Yield (pounds) Run A B C D A (hours) 12 2 3 18 B (%) 14 18 C (psi) 13 80 16 D (°C) 200 250 4 17 15 6. 20 15 8. 10 10 25 11 13 12 24 13 19 14 21 15 17 16 23 | +I + I + |