Exam 13: Correlation and Linear Regression

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.

The ___________ method determines the equation of a line that minimizes the sum of the squares of the vertical deviations about the line.

A scatter diagram is a graph that portrays the correlation between a dependent variable and an independent variable.

Based on the regression equation, we can _______________.

Given the least squares regression equation, Ŷ = 1,202 + 1,133X, when X = 3, what does Ŷ equal?

What is the test statistic to test the significance of the slope in a regression equation?

The minimum and maximum values of the coefficient of determination are ________.

If the correlation coefficient has a negative value, then the coefficient of determination:

Which of the following are the same between a confidence interval and a prediction interval?

Using the following regression analysis: What is the coefficient of determination?

The standard error of the estimate measures the scatter or dispersion of the observed values around a ___________________.

A company wants to study the effect of an employee's length of employment on their number of workdays absent. The results of the regression analysis follow. What is the meaning of a negative slope?

A sales manager for an advertising agency believes that there is a relationship between the number of contacts that a salesperson makes and the amount of sales dollars earned. What is the independent variable?

In plotting paired data in a scatter diagram, the dependent variable is scaled on the __________________.

A company wants to study the effect of an employee's length of employment on 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 sales manager for an advertising agency believes that there is a relationship between the number of contacts that a salesperson makes and the amount of sales dollars earned. A regression ANOVA shows the following results: What is the value of the coefficient of determination?

Assume the least squares equation is Ŷ = 10 + 20X. What does the value of 10 in the equation indicate?

If the correlation coefficient between two variables, X and Y, equals zero, what can be said of the variables X and Y?

A company wants to study the effect of an employee's length of employment on their number of workdays absent. The results of the regression analysis follow. What is the least squares equation?

A sales manager for an advertising agency believes that there is a relationship between the number of contacts that a salesperson makes and the amount of sales dollars earned. What is the dependent variable?