Question 1

A company wants to study the relationship between an employee's length of employment and their number of workdays absent.The company collected the following information on a random sample of seven employees.  What is the independent variable (X)? _________________

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Question 2

A company wants to study the relationship between an employee's length of employment and their number of workdays absent.The company collected the following information on a random sample of seven employees.  What is the dependent variable (Y)? _____________________

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Question 3

What is the direction of a regression line if its slope equals zero,indicating a lack of a relationship? ____________________

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Question 4

Select a value for the correlation coefficient and provide a complete interpretation of the correlation coefficient using your selected value.

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Question 5

A company wants to study the relationship between an employee's length of employment and their number of workdays absent.The company collected the following information on a random sample of seven employees.  What is the meaning of a negative slope? _________________________

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Question 6

The relationship between interest rates as a percent (X)and housing starts (Y)is given by the linear equation  = 4094 - 269X.
What happens to housing starts as interest rates fall? ________

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Question 7

An assumption of linear regression states that for each value of X,there is a group of Y values that are statistically __________________ and normally distributed about the regression line.

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Question 8

What variation does the coefficient of determination measure? _______

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Question 9

What is a measure of the scatter of observed values around the regression line called? _______________________________

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Question 10

In a regression analysis every value of y is converted to z with the following formula: z = log(y).What is the conversion called? _______

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Question 11

How does the prediction interval for an individual value of Y compare to the confidence interval for the mean value of Y? _______________

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Question 12

What are the input and the output of linear regression?

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Question 13

A company wants to study the relationship between an employee's length of employment and their number of workdays absent.The company collected the following information on a random sample of seven employees.

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Question 14

What is the purpose of measuring correlation?

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Question 15

What is the purpose of transformations in regression analysis?

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Quiz 13: Linear Regression and Correlation

A company wants to study the relationship between an employee's length of employment and their number of workdays absent.The company collected the following information on a random sample of seven employees. What is the independent variable (X)? _________________

A company wants to study the relationship between an employee's length of employment and their number of workdays absent.The company collected the following information on a random sample of seven employees. What is the dependent variable (Y)? _____________________

What is the direction of a regression line if its slope equals zero,indicating a lack of a relationship? ____________________

Select a value for the correlation coefficient and provide a complete interpretation of the correlation coefficient using your selected value.

A company wants to study the relationship between an employee's length of employment and their number of workdays absent.The company collected the following information on a random sample of seven employees. What is the meaning of a negative slope? _________________________

The relationship between interest rates as a percent (X)and housing starts (Y)is given by the linear equation = 4094 - 269X. What happens to housing starts as interest rates fall? ________

An assumption of linear regression states that for each value of X,there is a group of Y values that are statistically __________________ and normally distributed about the regression line.

What variation does the coefficient of determination measure? _______

What is a measure of the scatter of observed values around the regression line called? _______________________________

In a regression analysis every value of y is converted to z with the following formula: z = log(y).What is the conversion called? _______

How does the prediction interval for an individual value of Y compare to the confidence interval for the mean value of Y? _______________

What are the input and the output of linear regression?

A company wants to study the relationship between an employee's length of employment and their number of workdays absent.The company collected the following information on a random sample of seven employees.

What is the purpose of measuring correlation?

What is the purpose of transformations in regression analysis?