An engineer at a semiconductor company wants to model the relationship between the device gain and hFE(y) and three parameters: emitter-RS (x1), base-RS (x2), and emitter-to-base-RS (x3). The data are...

An engineer at a semiconductor company wants to model the relationship between the device gain and hFE(y) and three parameters: emitter-RS (x1), base-RS (x2), and emitter-to-base-RS (x3). The data are shown below:
(a) Fit a multiple linear regression to the data.
(b) Predict hFE when x1 = 14, x 2 = 220, and x3 = 5 [Data from Myers and Montgomery(2002)]