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Unformatted text preview: eshmen across the state. She asks her research
assistant to conduct a study to investigate what factors could account for the differences. The
research assistant looked at a random sample of school districts across the state and used the
factors of percentage of mathematics teachers in each district with a degree in mathematics,
the average age of mathematics teachers and the average salary of mathematics teachers s = 7.62090
Analysis of Variance Determine the 90% interval for β2 and interpret its meaning 11361 Chapter 01  An Introduction to Business Statistics 120. A member of the state legislature has expressed concern about the differences in the
mathematics test scores of high school freshmen across the state. She asks her research
assistant to conduct a study to investigate what factors could account for the differences. The
research assistant looked at a random sample of school districts across the state and used the
factors of percentage of mathematics teachers in each district with a degree in mathematics,
the average age of mathematics teachers and the average salary of mathematics teachers s = 7.62090
Analysis of Variance Based on the multiple regression model given above, estimate the mathematics test score and
calculate the value of the residual, if the percentage of teachers with a mathematics degree is
50.0, the average age is 43 and the average salary is 48,300 (48.3). The actual mathematics
test score for these factors is 68.50. 11362 Chapter 01  An Introduction to Business Statistics 121. A member of the state legislature has expressed concern about the differences in the
mathematics test scores of high school freshmen across the state. She asks her research
assistant to conduct a study to investigate what factors could account for the differences. The
research assistant looked at a random sample of school districts across the state and used the
factors of percentage of mathematics teachers in each district with a degree in mathematics,
the average age of mathematics teachers and the average salary of mathematics teachers s = 7.62090
Analysis of Variance Additional information related to this point estimate of 65.12 is given below.
Predicted Values for New Observations
50% with math degree, average age of 43 and average salary is 48.3
New Determine the 95% confidence interval for this estimate and interpret its meaning. 11363 Chapter 01  An Introduction to Business Statistics 122. A member of the state legislature has expressed concern about the differences in the
mathematics test scores of high school freshmen across the state. She asks her research
assistant to conduct a study to investigate what factors could account for the differences. The
research assistant looked at a random sample of school districts across the state and used the
factors of percentage of mathematics teachers in each district with a degree in mathematics,
the average age of mathematics teachers and the average salary of mathematics teachers s = 7.62090
Analysis of Variance Additional information related to this point estimate of 65.12 is given below.
Predicted Values for New Observations
50% with math degree, average age of 43 and average salary is 48.3
New Calculate the 95% prediction interval for this point estimate. Chapter 14 Multiple Regression Answer Key 11364 Chapter 01  An Introduction to Business Statistics
True / False Questions 1. Regression models that employ more than one independent variable are referred to as
multiple regression models.
TRUE AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Learning Objective: 1
Topic: Multiple regression model 2. The error term in the regression model describes the effects of all factors other than the
independent variables on y (response variable).
TRUE AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Learning Objective: 1
Topic: Multiple regression model 3. In a regression model, at any given combination of values of the independent variables, the
population of potential error terms is assumed to have an Fdistribution.
FALSE AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Learning Objective: 2
Topic: Multiple regression model 4. In a regression model, a value of the error term depends upon other values of the error
term.
FALSE AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Learning Objective: 2
Topic: Multiple regression model 11365 Chapter 01  An Introduction to Business Statistics 5. A ttest is used in testing the significance of an individual independent variable.
TRUE AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Learning Objective: 5
Topic: Significance of an independent variable 6. Due to the fact that multiple regression models consist of multiple independent variables,
residual analysis cannot be performed.
FALSE AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Easy
Learning Objective: 9
Topic: Residual analysis 7. When the F test is used to test the overall significance of a multiple regression model, if the
null hypothesis is rejected, it can be concluded that a...
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 Winter '14

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