Question: 2.10 Consider the semiconductor hFE data in Exercise 2.9. (a) Plot the residuals from this model versus y. Comment on the information in this plot.

2.10 Consider the semiconductor hFE data in Exercise 2.9.

(a) Plot the residuals from this model versus y. Comment on the information in this plot.

(b) What is the value of R2 for this model?

(c) Refit the model using In hFE as the response variable.

(d) Plot the residuals versus predicted In hFE for the model in part (c). Does this give any information about which model is preferable?

(e) Plot the residuals from the model in part (d), versus the regressor x3. Comment on this plot.

(f) Refit the model to In hFE using xu x2, and l/x3 as the regressors. Comment on the effect of this change in the model.

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