Compare the two best models that you have found in Problem 10.21 in terms of \(C_{p}\) by calculating the confidence intervals on the mean of the thrust response for all points in the original data set. Based on a comparison of these confidence intervals, which model would you prefer? Now calculate the PRESS statistic for these models. Which model would PRESS indicate is likely to be the best for predicting new observations on thrust?

Data From Problem 10.21

Table B. 13 presents data on the thrust of a jet turbine engine and six candidate regressors. Use all possible regressions and the CpCp${\mathrm{????}}_{\mathrm{????}}$ criterion to find an appropriate regression model for these data. Investigate model adequacy using residual plots.

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