SCENARIO 18-9
What are the factors that determine the acceleration time (in sec.)from 0 to 60 miles per hour of a
car? Data on the following variables for 171 different vehicle models were collected:
Accel Time: Acceleration time in sec.
Cargo Vol: Cargo volume in cu.ft.
HP: Horsepower
MPG: Miles per gallon
SUV: 1 if the vehicle model is an SUV with Coupe as the base when SUV and Sedan are both 0
Sedan: 1 if the vehicle model is a sedan with Coupe as the base when SUV and Sedan are both 0
The regression results using acceleration time as the dependent variable and the remaining variables
as the independent variables are presented below.

The various residual plots are as shown below.

A Roadmap for Analyzing Data 18-63

18-64 A Roadmap for Analyzing Data

-Referring to Scenario 18-9, what is the correct interpretation for the estimated coefficient for
Cargo Vol?
A) As the 0 to 60 miles per hour acceleration time increases by one second, the mean cargo volume will increase by an estimated 0.0259 cubic foot without taking into consideration
All the other independent variables included in the model.
B) As the cargo volume increases by one cubic foot, the mean 0 to 60 miles per hour acceleration time will increase by an estimated 0.0259 seconds without taking into
Consideration all the other independent variables included in the model.
C) As the 0 to 60 miles per hour acceleration time increases by one second, the mean cargo volume will increase by an estimated 0.0259 cubic foot taking into consideration all the
Other independent variables included in the model.
D) As the cargo volume increases by one cubic foot, the mean 0 to 60 miles per hour acceleration time will increase by an estimated 0.0259 seconds taking into consideration
All the other independent variables included in the model.

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