Question: 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

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 a = 0.05. Use the t-test to investigate the contribution of each variable to the model (a = 0.05). What are your conclusions?
(c) Plot the residuals versus and versus each of the transformed regressors. Comment on the plots.

= In y, xf x = Vx4. = 1/Vx. = Vx, x = 1/Vx3, Vx, x !! %3D = 1/Va,

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