# Stats Chapter 13 – Flashcards

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1. What is the variable used to predict the value of another called? A: Independent B:Dependent C:Correlation D:Determination
A: Independent
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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
D: All of the above
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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
C: 94% of total variation of one variable is explained by variation in the other variable
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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
C: 4,601
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5. What is the general form of the regression equation? A: Y' = ab B: Y' = a + bX C: Y' = a - bX D: Y' = abX
c:Y' = a + bX
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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
A: predict the value of the dependent variable given a value of the independent variable
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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.
B: for each unit increase in X, Y increases by 20.
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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
A: Y intercept
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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
D: 0.7
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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
C: 1.0
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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
D: 0.606
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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
D: 3.182
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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