Exam 9: Regression Analysis
Exam 1: Introduction to Business Analytics50 Questions
Exam 2: Analytics on Spreadsheets52 Questions
Exam 3: Visualizing and Exploring Data50 Questions
Exam 4: Descriptive Statistical Measures79 Questions
Exam 5: Probability Distributions and Data Modeling50 Questions
Exam 6: Sampling and Estimation59 Questions
Exam 7: Statistical Inference50 Questions
Exam 8: Predictive Modeling and Analysis64 Questions
Exam 9: Regression Analysis50 Questions
Exam 10: Forecasting Techniques55 Questions
Exam 11: Simulation and Risk Analysis50 Questions
Exam 12: Introduction to Data Mining53 Questions
Exam 13: Linear Optimization50 Questions
Exam 14: Applications of Linear Optimization62 Questions
Exam 15: Integer Optimization50 Questions
Exam 16: Nonlinear and Non-Smooth Optimization66 Questions
Exam 17: Optimization Models with Uncertainty50 Questions
Exam 18: Decision Analysis50 Questions
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The following table exhibits the age of antique furniture and the corresponding prices.Use the table to answer the following question(s).(Hint: Use scatter diagram and the Excel Trendline tool where necessary).
Number of years Value (\ ) 78 930 91 1010 83 970 159 1950 134 1610 210 2880 88 980 178 2010 124 1370 72 900
-In a linear relationship, which of the following accounts for the many possible values of the dependent variable that vary around the mean?
(Multiple Choice)
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Use the data given below to answer the following question(s).
Following is an extract from the database of a construction company.The table shows the height of walls in feet and the cost of raising them.The estimated simple linear regression equation is given as Ŷ = b0 + b1X.(Hint: Use Excel functions).
-What is the value of the coefficient b₀?
(Multiple Choice)
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The following table exhibits the age of antique furniture and the corresponding prices.Use the table to answer the following question(s).(Hint: Use scatter diagram and the Excel Trendline tool where necessary).
Number of years Value (\ ) 78 930 91 1010 83 970 159 1950 134 1610 210 2880 88 980 178 2010 124 1370 72 900
-What is the relationship between the age of the furniture and their values?
(Multiple Choice)
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Use the data given below to answer the following question(s).
Following is an extract from a firm's database detailing the number of hours spent on the job by employees and their corresponding pay.(Note: Assume a level of significance of 0.05 wherever necessary.)
-A good regression model has the fewest number of explanatory variables providing an adequate interpretation of the dependent variable.
(True/False)
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In a curvilinear regression model, the ________ represents the curvilinear effect.
(Multiple Choice)
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The following table exhibits the age of antique furniture and the corresponding prices.Use the table to answer the following question(s).(Hint: Use scatter diagram and the Excel Trendline tool where necessary).
Number of years Value (\ ) 78 930 91 1010 83 970 159 1950 134 1610 210 2880 88 980 178 2010 124 1370 72 900
-Which of the following equations correctly expresses the relationship between the two variables?
(Multiple Choice)
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Use the data given below to answer the following question(s).
Following is an extract from a firm's database detailing the number of hours spent on the job by employees and their corresponding pay.(Note: Assume a level of significance of 0.05 wherever necessary.)
-Explain the concept of curvilinear regression model.
(Essay)
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Use the data given below to answer the following question(s).
Following is an extract from the database of a construction company.The table shows the height of walls in feet and the cost of raising them.The estimated simple linear regression equation is given as Ŷ = b0 + b1X.(Hint: Use Excel functions).
-What is the estimated cost of raising a 10-inch wall?
(Multiple Choice)
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Use the data given below to answer the following question(s).
Following is an extract from a firm's database detailing the number of hours spent on the job by employees and their corresponding pay.(Note: Assume a level of significance of 0.05 wherever necessary.)
-Interpret the confidence intervals.
(Essay)
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A regression model that involves a single independent variable is called ________.
(Multiple Choice)
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The following table exhibits the age of antique furniture and the corresponding prices.Use the table to answer the following question(s).(Hint: Use scatter diagram and the Excel Trendline tool where necessary).
Number of years Value (\ ) 78 930 91 1010 83 970 159 1950 134 1610 210 2880 88 980 178 2010 124 1370 72 900
-Which of the following is true about the observed errors associated with estimating the value of the dependent variable using the regression line?
(Multiple Choice)
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When using the t-statistic in multiple regression to determine if a variable should be removed:
(Multiple Choice)
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Use the data given below to answer the following question(s).
Following is an extract from a firm's database detailing the number of hours spent on the job by employees and their corresponding pay.(Note: Assume a level of significance of 0.05 wherever necessary.)
-Draw conclusions for test of hypothesis for regression coefficients.
(Essay)
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Use the data given below to answer the following question(s).
Following is an extract from the database of a construction company.The table shows the height of walls in feet and the cost of raising them.The estimated simple linear regression equation is given as Ŷ = b0 + b1X.(Hint: Use Excel functions).
-Which of the following statements is true when using the Excel Regression tool?
(Multiple Choice)
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Use the data given below to answer the following question(s).
Following is an extract from a firm's database detailing the number of hours spent on the job by employees and their corresponding pay.(Note: Assume a level of significance of 0.05 wherever necessary.)
-An increase in adjusted R² indicates that the regression model has improved.
(True/False)
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Which of the following is true when testing for normality of errors?
(Multiple Choice)
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A(n)________ is an extreme value that is different from the rest of the data.
(Multiple Choice)
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How many additional dummy variables are required if a categorical variable has 4 levels?
(Multiple Choice)
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Which of the following is true about multiple linear regression?
(Multiple Choice)
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