Question 1

Estimates of the slope,intercept,and error of a regression model are found from sample data.

Accepted Answer

A) True 
 B)False

Question 2

If the significance level for the F-test is high enough,there is a relationship between the dependent and independent variables.

Accepted Answer

A) True 
 B)False

Question 3

A large department store has collected the following monthly data on lost sales revenue due to theft and the number of security guard hours on duty:   (a)Determine the least squares regression equation.
(b)Using the results of part (a),find the estimated lost sales revenues if the total number of security guard hours is 800.
(c)Calculate the coefficient of correlation.
(d)Calculate the coefficient of determination.

Accepted Answer

(a)least squares equation: Y =

Question 4

Explain what r2 is.

Accepted Answer

It is a value between 0 and +1

Question 5

Describe the purpose and structure of a scatter diagram.

Accepted Answer

A scatter diagram is a graphical method

Question 6

Explain what the correlation coefficient is.

Accepted Answer

It is a value between -1 and +

Question 7

The coefficient of determination resulting from a particular regression analysis was 0.85.What was the slope of the regression line?

Accepted Answer

A) 0.85 
B) -0.85 
C) 0.922 
D) There is insufficient information to answer the question. 
E) None of the above 
A) 0.85 
B) -0.85 
C) 0.922 
D) There is insufficient information to answer the question. 
E) None of the above

Question 8

Errors are also called residuals.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following is not an assumption of the regression model?

Accepted Answer

A) The errors are independent. 
B) The errors are normally distributed. 
C) The errors have constant variance. 
D) The mean of the errors is zero. 
E) The errors should have a standard deviation equal to one. 
A) The errors are independent. 
B) The errors are normally distributed. 
C) The errors have constant variance. 
D) The mean of the errors is zero. 
E) The errors should have a standard deviation equal to one.

Question 10

In regression,there is random error that can be predicted.

Accepted Answer

A) True 
 B)False

Question 11

For each qualitative variable,the number of dummy variables must equal ________ the number of categories of the qualitative variable.

Accepted Answer

The answer of For each qualitative variable,the number of dummy...

Question 12

Which of the following is true regarding a regression model with multicollinearity,a high r2 value,and a low F-test significance level?

Accepted Answer

A) The model is not a good prediction model. 
B) The high value of r2 is due to the multicollinearity. 
C) The interpretation of the coefficients is valuable. 
D) The significance level tests for the coefficients are not valid. 
E) The significance level for the F-test is not valid. 
A) The model is not a good prediction model. 
B) The high value of r2 is due to the multicollinearity. 
C) The interpretation of the coefficients is valuable. 
D) The significance level tests for the coefficients are not valid. 
E) The significance level for the F-test is not valid.

Question 13

Which of the following statements is true regarding a scatter diagram?

Accepted Answer

A) It provides very little information about the relationship between the regression variables. 
B) It is a plot of the independent and dependent variables. 
C) It is a line chart of the independent and dependent variables. 
D) It has a value between -1 and +1. 
E) It gives the percent of variation in the dependent variable that is explained by the independent variable. 
A) It provides very little information about the relationship between the regression variables. 
B) It is a plot of the independent and dependent variables. 
C) It is a line chart of the independent and dependent variables. 
D) It has a value between -1 and +1. 
E) It gives the percent of variation in the dependent variable that is explained by the independent variable.

Estimates of the slope,intercept,and error of a regression model are found from sample data.

If the significance level for the F-test is high enough,there is a relationship between the dependent and independent variables.

Explain what r² is.

Describe the purpose and structure of a scatter diagram.

Explain what the correlation coefficient is.

The coefficient of determination resulting from a particular regression analysis was 0.85.What was the slope of the regression line?

Errors are also called residuals.

Which of the following is not an assumption of the regression model?

In regression,there is random error that can be predicted.

For each qualitative variable,the number of dummy variables must equal ________ the number of categories of the qualitative variable.

Which of the following is true regarding a regression model with multicollinearity,a high r²value,and a low F-test significance level?

Which of the following statements is true regarding a scatter diagram?

Introduction to Quantitative Analysis

Probability Concepts and Applications

Decision Analysis

Forecasting

Inventory Control Models

Linear Programming Models: Graphical and Computer Methods

Linear Programming Applications

Transportation,assignment,and Network Models

Integer Programming,goal Programming,and Nonlinear Programming

Project Management

Waiting Lines and Queuing Theory Models

Simulation Modeling

Markov Analysis

Statistical Quality Control

Analytic Hierarchy Process

Dynamic Programming

Decision Theory and the Normal Distribution

Game Theory

Mathematical Tools: Determinants and Matrices

Calculus-Based Optimization

Linear Programming: The Simplex Method

Transportation, Assignment, and Network Algorithms

Filters

Exam 4: Regression Models

Estimates of the slope,intercept,and error of a regression model are found from sample data.

If the significance level for the F-test is high enough,there is a relationship between the dependent and independent variables.

Explain what r2 is.

Describe the purpose and structure of a scatter diagram.

Explain what the correlation coefficient is.

The coefficient of determination resulting from a particular regression analysis was 0.85.What was the slope of the regression line?

Errors are also called residuals.

Which of the following is not an assumption of the regression model?

In regression,there is random error that can be predicted.

For each qualitative variable,the number of dummy variables must equal ________ the number of categories of the qualitative variable.

Which of the following is true regarding a regression model with multicollinearity,a high r2 value,and a low F-test significance level?

Which of the following statements is true regarding a scatter diagram?

Introduction to Quantitative Analysis

Probability Concepts and Applications

Decision Analysis

Forecasting

Inventory Control Models

Linear Programming Models: Graphical and Computer Methods

Linear Programming Applications

Transportation,assignment,and Network Models

Integer Programming,goal Programming,and Nonlinear Programming

Project Management

Waiting Lines and Queuing Theory Models

Simulation Modeling

Markov Analysis

Statistical Quality Control

Analytic Hierarchy Process

Dynamic Programming

Decision Theory and the Normal Distribution

Game Theory

Mathematical Tools: Determinants and Matrices

Calculus-Based Optimization

Linear Programming: The Simplex Method

Transportation, Assignment, and Network Algorithms

Filters

Explain what r² is.

Which of the following is true regarding a regression model with multicollinearity,a high r²value,and a low F-test significance level?