Reconsider the electronic inverter data in Table B.14. Use stepwise regression to find an appropriate regression model for these data. Investigate model adequacy using residual plots. Compare this model with the one found by the all-possible-regressions approach in Problem 10.24.

Problem 10.24

Table B. 14 presents data on the transient points of an electronic inverter. Use all possible regressions and the Cp${\mathrm{????}}_{\mathrm{????}}$ criterion to find an appropriate regression model for these data. Investigate model adequacy using residual plots.

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Observation Number X x2 X3 X4 Xs y 12345678OUNDBAR 383400 8 6 9 10 10 16 11 12 10 3 10 15 19 15 20 15 21 10 22 23 24 083345205503623 25 3864653428 m m +22322326880 3064786JO2O36882256648633 6 12 3883 0.787 0.293 1.710 0.203 5 0.806 5 4.713 3 25 0.607 4 25 9.107 12 25 9.210 25 1.365 25 4.554 3 0.293 50 2.252 50 9.167 82333332468 50 0.694 50 0.379 50 0.485 50 3.345 50 0.208 75 0.201 75 0.329 75 4.966 75 1.362 75 1.515 75 0.751