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TABLE 13-16
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.
The coefficient of multiple determination for the regression model using each of the 5 variables Xj as the dependent variable and all other X variables as independent variables (Rj2) are, respectively, 0.7461, 0.5676, 0.6764, 0.8582, 0.6632.
-Referring to Table 13-16, which of the following assumptions is most likely violated based on the normal probability plot?
Nervous Mannerism
Behaviors or actions displayed by individuals when they are anxious or stressed.
Verbal Spacers
Filler sounds or words, such as "um," "like," or "you know," used by speakers during conversation to pause for thought without breaking the flow of speech.
Elevator Speech
A brief and persuasive speech used to spark interest in what a person, organization, or project does, often delivered in the time span of an elevator ride.
Philippic
A fiery, damning speech, or tirade, often directed against someone or something.
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