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AP Statistics Chapter 3 Review

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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

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

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

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Fastest Responders (in seconds) 23.64Participant 1 34.13Participant 4 34.5Participant 12 42.24Participant 11 42.53Participant 14

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

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Equation for LSRL is y-hat = 1.3 +0.73x. What is the residual for the point (4,7)? 1. 2.78 2. 3.00 3. 4.00 4. 4.22 5. 7.00

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

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Participant Scores 600Participant 11 500Participant 7 500Participant 8 500Participant 14 500Participant 17

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

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

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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

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Fastest Responders (in seconds) 7.8Participant 4 9.55Participant 9 10.77Participant 12 11.16Participant 3 11.34Participant 1

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

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

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A point on a scatterplot represents: 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.

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Participant Scores 900Participant 14 900Participant 17 800Participant 1 800Participant 2 800Participant 11

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