Question: In a study to explore the effect of small increases in the sizes of the three factors that are believed to influence the response of
In a study to explore the effect of small increases in the sizes of the three factors that are believed to influence the response of a process, the following data were obtained.

Fit a first-order model to the data and determine the next action to be taken.
21 I2 3 y I1 I2 T3 y -1 -1 -1 11.45 1 1 1 16.85 1 -1 -1 20.2 0 0 0 14.1 1 1 -1 8.75 0 0 0 14.8 1 -1 11.6 0 0 0 14.8 1 10.1 0 0 0 14.3 1 1 18.85 0 0 0 14.3 -1 1 1 7.55
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