Reconsider the data in Exercise 8.12. Suppose that four center points were added to this experiment. The molecular weights at the center point are 90, 87, 86, and 93.
In exercise

a. Analyze the data as you did in Exercise 8.12, but include a test for curvature.
b. If curvature is significant in an experiment such as this one, describe what strategy you would pursue next to improve your model of the process.

Transcribed Image Text:

(1) 88 d 86 a 80 ad 81 b 89 bd 85 ab 87 abd 86 с 86 cd 85 ac 81 acd 79 bc 82 cd 84 abc 80 abcd 81