Set up the regression using the four regressors, log(Bread), log(Bus), log(TeachGI), and Apt0.33, and with response BigMac. Draw the inverse fitted value plot of ŷ versus BigMac. Estimate the best power transformation. Check on the adequacy of your estimate by refitting the regression model with the transformed response and drawing the inverse response plot again. If transformation was successful, this second inverse fitted value plot should have a linear mean function.
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