Stats Chapter 13 – Flashcards

1. What is the variable used to predict the value of another called? A: Independent B:Dependent C:Correlation D:Determination

2. Which of the following statements regarding the coefficient of correlation is true? A: It ranges from -1.0 to +1.0 inclusive B: It measures the strength of the relationship between two variables C: A value of 0.00 indicates two variables are not related D: All of the above

3. What can we conclude if the coefficient of determination is 0.94? A: What can we conclude if the coefficient of determination is 0.94? B: Direction of relationship is positive C: 94% of total variation of one variable is explained by variation in the other variable D: All of the above are correct

4. Suppose the least squares regression equation is Y' = 1202 + 1,133X. When X = 3, what does Y' equal? A: 5,734 B: 8,000 C: 4,601 D: 4,050

5. What is the general form of the regression equation? A: Y' = ab B: Y' = a + bX C: Y' = a - bX D: Y' = abX

6. Based on the regression equation, we can A: predict the value of the dependent variable given a value of the independent variable B: predict the value of the independent variable given a value of the dependent variable C: measure the association between two variables D: all of the above

7. In the least squares equation, Y' = 10 + 20X the value of 20 indicates A: the Y intercept B: for each unit increase in X, Y increases by 20. C: for each unit increase in Y, X increases by 20 D: none of the above.

Assume the least squares equation is Y' = 10 + 20X. What does the value of 10 in the equation indicate? A: Y intercept B: For each unit increased in Y, X increases by 10 C: For each unit increased in X, Y increases by 10 D: None of the above

9. Given the following five points: (-2,0), (-1,0), (0,1), (1,1), and (2,3). What is the slope of the line? A: 0.0 B: 0.5 C: 0.6 D: 0.7

10. Given the following five points: (-2,0), (-1,0), (0,1), (1,1), and (2,3). What is the Y intercept? A: 0.0 B: 0.7 C: 1.0 D: 1.5

11. Given the following five points: (-2,0), (-1,0), (0,1), (1,1), and (2,3). What is the standard error of the estimate? A: 0 B: 0.135 C: 0.367 D: 0.606

12. Given the following five points: (-2,0), (-1,0), (0,1), (1,1), and (2,3). What is the critical value necessary to determine a confidence interval for a 95% level of confidence? A: 2.132 B: 2.353 C: 2.776 D: 3.182

13. Given the following five points: (-2,0), (-1,0), (0,1), (1,1), and (2,3). What is the critical value necessary to determine a confidence interval for a 90% level of confidence? A: 1.533 B: 1.638 C: 2.132 D: 2.353

14. Given the following five points: (-2,0), (-1,0), (0,1), (1,1), and (2,3). If the regression equation is Y' = 2 - 0.4X, what is the value of Y' when X = -3? A: 0.8 B: 3.2 C: -10.0 D: 14.0

15. A sales manager for an advertising agency believes there is a relationship between the number of contacts and the amount of the sales. To verify this believe, the following data was collected: What is the slope of the linear equation? A: -12.201 B: 12.201 C: 2.1946 D: -2.1946