Repeat Problem 8-12 using 1 = -ABCD. Does use of the alternate fraction change your interpretation of

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Repeat Problem 8-12 using 1 = -ABCD. Does use of the alternate fraction change your interpretation of the data?


Problem 8-12

Analyze the data in Problem 6-23 as if it came from a 24-1IV design with 1 = ABCD. Project the design into a full factorial in the subset of the original four factors that appear to be significant.


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:

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

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