Question 1

The following scatter plot indicates that _________.

Accepted Answer

A) a log x transform may be useful 
B) a log y transform may be useful 
C) a x2 transform may be useful 
D) no transform is needed 
E) a 1/x transform may be useful 
A) a log x transform may be useful 
B) a log y transform may be useful 
C) a x2 transform may be useful 
D) no transform is needed 
E) a 1/x transform may be useful

Question 2

If a data set contains k independent variables,the "all possible regression" search procedure will determine 2k different models.

Accepted Answer

A) True 
 B)False

Question 3

Inspection of the following table of correlation coefficients for variables in a multiple regression analysis reveals that the first independent variable entered by the forward selection procedure will be ___________.

Accepted Answer

A) x1 
B) x2 
C) x3 
D) x4 
E) x5 
A) x1 
B) x2 
C) x3 
D) x4 
E) x5

Question 4

A local parent group was concerned with the increasing school cost for families with school aged children.The parent group was interested in understanding the relationship between the
The academic grade level for the child and the total costs spent per child per academic year.They
Performed a multiple regression analysis using total cost as the dependent variable and academic
Year (x1)as the independent variables.The multiple regression analysis produced the following
Tables.
    
Using $\alpha$ = 0.05 to test the null hypothesis H0: $\beta$1 = 0,the critical t value is ____.

Accepted Answer

A) ± 1.311 
B) ± 1.699 
C) ± 1.703 
D) ± 2.502 
E) ± 2.052 
A) ± 1.311 
B) ± 1.699 
C) ± 1.703 
D) ± 2.502 
E) ± 2.052

Question 5

An acceptable method of managing multicollinearity in a regression model is the ___.

Accepted Answer

A) use the forward selection procedure 
B) use the backward elimination procedure 
C) use the forward elimination procedure 
D) use the stepwise regression procedure 
E) use all possible regressions 
A) use the forward selection procedure 
B) use the backward elimination procedure 
C) use the forward elimination procedure 
D) use the stepwise regression procedure 
E) use all possible regressions

Question 6

The interaction between two independent variables can be examined by including a new variable,which is the sum of the two independent variables,in the regression model.

Accepted Answer

A) True 
 B)False

Question 7

Alan Bissell,a market analyst for City Sound Online Mart,is analyzing sales from heavy metal song downloads.Alan's dependent variable is annual heavy metal song download sales (in $1,000,000's),and his independent variables are website visitors (in 1,000's)and type of download format requested (0 = MP3,1 = other).Regression analysis of the data yielded the following tables.   For an MP3 sales with 10,000 website visitors,Alan's model predicts annual sales of heavy metal dong downloads of ________________.

Accepted Answer

A) $2,100,000 
B) $524,507 
C) $533,333 
D) $729,683 
E) $21,000,000 
A) $2,100,000 
B) $524,507 
C) $533,333 
D) $729,683 
E) $21,000,000

Question 8

A multiple regression analysis produced the following tables.     For x1= 20,the predicted value of y is ____________.

Accepted Answer

A) 5,204.18. 
B) 2,031.38 
C) 2,538.86 
D) 6262.19 
E) 6,535.86 
A) 5,204.18. 
B) 2,031.38 
C) 2,538.86 
D) 6262.19 
E) 6,535.86

Question 9

The following scatter plot indicates that _________.

Accepted Answer

A) a log x transform may be useful 
B) a log y transform may be useful 
C) an x2 transform may be useful 
D) no transform is needed 
E) a (- x)transform may be useful 
A) a log x transform may be useful 
B) a log y transform may be useful 
C) an x2 transform may be useful 
D) no transform is needed 
E) a (- x)transform may be useful

Question 10

If each pair of independent variables is weakly correlated,there is no problem of multicollinearity.

Accepted Answer

A) True 
 B)False

Question 11

A multiple regression analysis produced the following tables.     For x1= 10,the predicted value of y is ____________.

Accepted Answer

A) 8.88. 
B) 2,031.38 
C) 2,53.86 
D) 262.19 
E) 2,535.86 
A) 8.88. 
B) 2,031.38 
C) 2,53.86 
D) 262.19 
E) 2,535.86

Question 12

Which of the following iterative search procedures for model-building in a multiple regression analysis adds variables to model as it proceeds,but does not reevaluate the contribution of previously entered variables?

Accepted Answer

A) Backward elimination 
B) Stepwise regression 
C) Forward selection 
D) All possible regressions 
E) Forward elimination 
A) Backward elimination 
B) Stepwise regression 
C) Forward selection 
D) All possible regressions 
E) Forward elimination

Question 13

Abby Kratz,a market specialist at the market research firm of Saez,Sikes,and Spitz,is analyzing household budget data collected by her firm.Abby's dependent variable is weekly household expenditures on groceries (in $'s),and her independent variables are annual household income (in $1,000's)and household neighborhood (0 = suburban,1 = rural).Regression analysis of the data yielded the following table.   Abby's model is ________________.

Accepted Answer

A) y = 19.68247 + 10.01176 x1 + 1.965934 x2 
B) y = 1.965934 + 9.940612 x1 + 6.416667 x2 
C) y = 10.01176 + 0.174564 x1 + 7.655776 x2 
D) y = 19.68247 - 1.735272 x1 + 49.12456 x2 
E) y = 19.68247 + 1.735272 x1 + 49.12456 x2 
A) y = 19.68247 + 10.01176 x1 + 1.965934 x2 
B) y = 1.965934 + 9.940612 x1 + 6.416667 x2 
C) y = 10.01176 + 0.174564 x1 + 7.655776 x2 
D) y = 19.68247 - 1.735272 x1 + 49.12456 x2 
E) y = 19.68247 + 1.735272 x1 + 49.12456 x2

Question 14

Recoding data cannot improve the fit of a regression model.

Accepted Answer

A) True 
 B)False

Question 15

The regression model y = $\beta$0 + $\beta$1 x1 + $\beta$2 x2 + $\beta$3 x3 + $\varepsilon$ is a third order model.

Accepted Answer

A) True 
 B)False

Question 16

Large correlations between two or more independent variables in a multiple regression model could result in the problem of ________.

Accepted Answer

A) multicollinearity 
B) autocorrelation 
C) partial correlation 
D) rank correlation 
E) non-normality 
A) multicollinearity 
B) autocorrelation 
C) partial correlation 
D) rank correlation 
E) non-normality

Question 17

Inspection of the following table of correlation coefficients for variables in a multiple regression analysis reveals that the first independent variable that will be entered into the regression model by the forward selection procedure will be ___________.

Accepted Answer

A) x1 
B) x2 
C) x3 
D) x4 
E) x5 
A) x1 
B) x2 
C) x3 
D) x4 
E) x5

Question 18

A useful technique in controlling multicollinearity involves the _________.

Accepted Answer

A) use of variance inflation factors 
B) use the backward elimination procedure 
C) use the forward elimination procedure 
D) use the forward selection procedure 
E) use all possible regressions 
A) use of variance inflation factors 
B) use the backward elimination procedure 
C) use the forward elimination procedure 
D) use the forward selection procedure 
E) use all possible regressions

Question 19

After a transformation of the y-variable values into log y,and performing a regression analysis produced the following tables.     For x1= 10,the predicted value of y is ____________.

Accepted Answer

A) 155.79 
B) 1.25 
C) 2.42 
D) 189.06 
E) 18.90 
A) 155.79 
B) 1.25 
C) 2.42 
D) 189.06 
E) 18.90

Question 20

Hope Hernandez is the new regional Vice President for a large gasoline station chain.She wants a regression model to predict sales in the convenience stores.Her data set includes two qualitative variables: the gasoline station location (inner city,freeway,and suburbs),and curb appeal of the convenience store (low,medium,and high).The number of dummy variables needed for "curb appeal" in Hope's regression model is ______.

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

The following scatter plot indicates that _________.

If a data set contains k independent variables,the "all possible regression" search procedure will determine 2^k different models.

Inspection of the following table of correlation coefficients for variables in a multiple regression analysis reveals that the first independent variable entered by the forward selection procedure will be ___________.

An acceptable method of managing multicollinearity in a regression model is the ___.

The interaction between two independent variables can be examined by including a new variable,which is the sum of the two independent variables,in the regression model.

A multiple regression analysis produced the following tables. For x1= 20,the predicted value of y is ____________.

The following scatter plot indicates that _________.

If each pair of independent variables is weakly correlated,there is no problem of multicollinearity.

A multiple regression analysis produced the following tables. For x1= 10,the predicted value of y is ____________.

Which of the following iterative search procedures for model-building in a multiple regression analysis adds variables to model as it proceeds,but does not reevaluate the contribution of previously entered variables?

Recoding data cannot improve the fit of a regression model.

The regression model y = $\beta$ 0 + $\beta$ 1 x1 + $\beta$ 2 x2 + $\beta$ 3 x3 + $\varepsilon$ is a third order model.

Large correlations between two or more independent variables in a multiple regression model could result in the problem of ________.

Inspection of the following table of correlation coefficients for variables in a multiple regression analysis reveals that the first independent variable that will be entered into the regression model by the forward selection procedure will be ___________.

A useful technique in controlling multicollinearity involves the _________.

After a transformation of the y-variable values into log y,and performing a regression analysis produced the following tables. For x1= 10,the predicted value of y is ____________.

Introduction to Statistics

Charts and Graphs

Descriptive Statistics

Probability

Discrete Distributions

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

Analysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

Exam 14: Building Multiple Regression Models

The following scatter plot indicates that _________.

If a data set contains k independent variables,the "all possible regression" search procedure will determine 2k different models.

Inspection of the following table of correlation coefficients for variables in a multiple regression analysis reveals that the first independent variable entered by the forward selection procedure will be ___________.

An acceptable method of managing multicollinearity in a regression model is the ___.

The interaction between two independent variables can be examined by including a new variable,which is the sum of the two independent variables,in the regression model.

A multiple regression analysis produced the following tables. For x1= 20,the predicted value of y is ____________.

The following scatter plot indicates that _________.

If each pair of independent variables is weakly correlated,there is no problem of multicollinearity.

A multiple regression analysis produced the following tables. For x1= 10,the predicted value of y is ____________.

Which of the following iterative search procedures for model-building in a multiple regression analysis adds variables to model as it proceeds,but does not reevaluate the contribution of previously entered variables?

Recoding data cannot improve the fit of a regression model.

The regression model y = β\betaβ 0 + β\betaβ 1 x1 + β\betaβ 2 x2 + β\betaβ 3 x3 + ε\varepsilonε is a third order model.

Large correlations between two or more independent variables in a multiple regression model could result in the problem of ________.

Inspection of the following table of correlation coefficients for variables in a multiple regression analysis reveals that the first independent variable that will be entered into the regression model by the forward selection procedure will be ___________.

A useful technique in controlling multicollinearity involves the _________.

After a transformation of the y-variable values into log y,and performing a regression analysis produced the following tables. For x1= 10,the predicted value of y is ____________.

Introduction to Statistics

Charts and Graphs

Descriptive Statistics

Probability

Discrete Distributions

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

Analysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

If a data set contains k independent variables,the "all possible regression" search procedure will determine 2^k different models.

The regression model y = $\beta$ 0 + $\beta$ 1 x1 + $\beta$ 2 x2 + $\beta$ 3 x3 + $\varepsilon$ is a third order model.