12-67. Consider the inverter data in Exercise 12-66. Delete observation 2 from the
Chapter 12, Problem 12-67(choose chapter or problem)
12-67. Consider the inverter data in Exercise 12-66. Delete observation 2 from the original data. Define new variables as follows: and (a) Fit a regression model using these transformed regressors (do not use x5). (b) Test the model for significance of regression using 0.05. Use the t-test to investigate the contribution of each variable to the model ( 0.05). What are your conclusions? (c) Plot the residuals versus and versus each of the transformed regressors. Comment on the plots.
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