Predictor (x) Variables P-Value R Adjusted R 0.000 0.943 Regression Equation CITY = 6.86 – 0.00128 WT 0.933 WT/DISP/HWY 0.257 DISP + 0.652 HWY CITY = 38.0 – 0.00395 WT – 1.29 DISP CITY = 6.69 – 0.00159 WT + 0.670 HWY CITY - 1.87 - 0.625 DISP + 0.706 HWY CITY = 41.8 - 0.00607 WT CITY = 29.0 - 2.98 DISP = -3.15 + 0.819 HWY 0.000 0.748 0.000 0.942 0.000 0.935 0.000 0.712 0.720 WT/DISP 0.935 WT/HWY 0.928 DISP/HWY 0.697 WT DISP 0.641 0.000 0.659 0.924 0.000 0.920 HWY CITY

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City Fuel Consumption: Finding the Best Multiple Regression Equation. In Exercises 9–12, refer to the accompanying table, which was obtained using the data from 21 cars listed in Data Set 20 “Car Measurements” in Appendix B. The response (y) variable is CITY (fuel consumption in mi/gal). The predictor (x) variables are WT (weight in pounds), DISP (engine displacement in liters), and HWY (highway fuel consumption in mi /gal).

A Honda Civic weighs 2740 lb, it has an engine displacement of 1.8 L, and its highway fuel consumption is 36 mi/gal. What is the best predicted value of the city fuel consumption? Is that predicted value likely to be a good estimate? Is that predicted value likely to be very accurate?

Predictor (x) Variables P-Value R Adjusted R
0.000 0.943
Regression Equation
CITY = 6.86 – 0.00128 WT
0.933
WT/DISP/HWY
0.257 DISP + 0.652 HWY
CITY = 38.0 – 0.00395 WT – 1.29 DISP
CITY = 6.69 – 0.00159 WT + 0.670 HWY
CITY - 1.87 - 0.625 DISP + 0.706 HWY
CITY = 41.8 - 0.00607 WT
CITY = 29.0 - 2.98 DISP
= -3.15 + 0.819 HWY
0.000 0.748
0.000 0.942
0.000 0.935
0.000 0.712
0.720
WT/DISP
0.935
WT/HWY
0.928
DISP/HWY
0.697
WT
DISP
0.641
0.000
0.659
0.924
0.000
0.920
HWY
CITY
Transcribed Image Text:Predictor (x) Variables P-Value R Adjusted R 0.000 0.943 Regression Equation CITY = 6.86 – 0.00128 WT 0.933 WT/DISP/HWY 0.257 DISP + 0.652 HWY CITY = 38.0 – 0.00395 WT – 1.29 DISP CITY = 6.69 – 0.00159 WT + 0.670 HWY CITY - 1.87 - 0.625 DISP + 0.706 HWY CITY = 41.8 - 0.00607 WT CITY = 29.0 - 2.98 DISP = -3.15 + 0.819 HWY 0.000 0.748 0.000 0.942 0.000 0.935 0.000 0.712 0.720 WT/DISP 0.935 WT/HWY 0.928 DISP/HWY 0.697 WT DISP 0.641 0.000 0.659 0.924 0.000 0.920 HWY CITY
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