The Editors of a National Automotive Magazine Recently Studied 30

question 84

Multiple Choice

The editors of a national automotive magazine recently studied 30 different automobiles sold in the United States with the intent of seeing whether they could develop a multiple regression model to explain the variation in highway miles per gallon.A number of different independent variables were collected.The following regression output is the result of using a forward selection stepwise regression approach. Which of the following might explain why no other independent variables entered the model?

• A)No other variable had a correlation with the dependent variable that was close to 1.0.
• B)None of the remaining variables had a positive correlation with y.
• C)The remaining variables must be nearly perfectly correlated with the two variables already in the model.
• D)Given the two variables already in the model,none of the others could add significantly to the percentage of variation in the y variable that would be explained by the model.