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AP Statistics Chapter 3 Review

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1. As the ellipse formed by points on a scatterplot becomes thinner, the strength of the correlation between the scores: 1. Becomes lower 2. Becomes higher 3. Remains constant 4. Becomes zero 12345 10

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2. The lowest strength of correlation of the following is: 10 1. 0.26 2. -0.45 3. 0.05 4. -0.90 12345

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3. The following are resistant to outliers: 10 1. Least squares regression line 2. Correlation coefficient 3. Both of the above 4. Neither of the above 5. It depends 12345

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4. Which of the following would not be a correct interpretation of r = -.30? 10 1. Variables are inversely related. 2. Coefficient of determination is.09. 3. 30% of variation between variables is linear. 4. There is a weak relationship between the variables. 5. All above are correct. 12345

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5. Equation for LSRL is y-hat = 1.3 +0.73x What is the residual for the point (4,7)? 10 12345 1. 2.78 2. -2.78 3. 1.30 4. -4.22 5. 7.00

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6. Imagine two boys on a seesaw moving up and down. The r value of their heights off the ground would be: 10 1. 0.00 2. 1.00 3. -1.00 4. 0.50 5. -0.50 12345

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7. If the correlation between X and Y is 0.94, which is true? 10 1. X causes Y 2. Y causes X 3. Low scores on X are associated with high scores on Y 4. Low scores on X are associated with low scores on Y. 12345

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8. A residual plot for linear data looks linear. 1. True 2. False 10 12345

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9. Test A results correlate -0.94 with results on the Nat’l Merit Scholarship exam. Because of the negative sign, this relationship is considered to be weak. 1. True 2. False 10 12345

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10. Switching the explanatory and response variables on a scatterplot affects the 10 1. Correlation 2. LSRL 3. Both the above 4. Neither the above 5. It depends 12345

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11. If the coefficient of determination between two variables is 0.81, then the correlation is 0.90. 10 1. True 2. False 3. It depends 12345

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12. A point on a scatterplot could represent: 10 1. Two scores of 2 people. 2. One score made by 2 different people. 3. Two different scores of 1 person. 4. One score of 1 person. 12345

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