Question: An engineer at a semiconductor company wants to model the relationship between the gain or hFE of a device (y) and three parameters: emitter-RS (x

An engineer at a semiconductor company wants to model the relationship between the gain or hFE of a device (y) and three parameters: emitter-RS (x ), base-RS (x ), and emitter-tobase-

RS (x ). The data are shown below:

(Data from Myers, Montgomery, and Anderson-Cook, 2009.)

1. Fit a multiple linear regression to the data.

2. Predict hFE when x = 14, x = 220, and x = 5.

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