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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: 10 Becomes lower Becomes higher Remains constant Becomes zero 1 2 3 4 5

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**2. The lowest strength of correlation of the following is:**

0.26 -0.45 0.05 -0.90 10 1 2 3 4 5

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**3. The following are resistant to outliers:**

Least squares regression line Correlation coefficient Both of the above Neither of the above It depends 10 1 2 3 4 5

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**4. Which of the following would not be a correct interpretation of r = -.30?**

Variables are inversely related. Coefficient of determination is .09. 30% of variation between variables is linear. There is a weak relationship between the variables. All above are correct. 10 1 2 3 4 5

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**5. Equation for LSRL is y-hat = 1. 3 +0**

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

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**6. Imagine two boys on a seesaw moving up and down**

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

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**7. If the correlation between X and Y is 0.94, which is true?**

10 X causes Y Y causes X Low scores on X are associated with high scores on Y Low scores on X are associated with low scores on Y. 1 2 3 4 5

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**8. A residual plot for linear data looks linear.**

10 True False 1 2 3 4 5

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**9. Test A results correlate -0**

9. Test A results correlate with results on the Nat’l Merit Scholarship exam. Because of the negative sign, this relationship is considered to be weak. 10 True False 1 2 3 4 5

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**10. Switching the explanatory and response variables on a scatterplot affects the**

Correlation LSRL Both the above Neither the above It depends 1 2 3 4 5

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**11. If the coefficient of determination between two variables is 0**

11. If the coefficient of determination between two variables is 0.81, then the correlation is 0.90. 10 True False It depends 1 2 3 4 5

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**12. A point on a scatterplot could represent:**

Two scores of 2 people. One score made by 2 different people. Two different scores of 1 person. One score of 1 person. 10 1 2 3 4 5

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