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AP+Statistics+Chapter+3+Section+3 (1)

# AP+Statistics+Chapter+3+Section+3 (1) - AP Statistics...

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AP Statistics Chapter 3 Section 3

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Vocab Least Squares Regression Line Regression line, line of best fit Mathematical model Predict Slope Intercept Coefficient of determination Residuals Residual plot Round-off error Outlier Influential observation
Does the age at which a child begins to talk predict later score on a test of mental ability? Child Age (in months) Score 1 15 95 2 26 71 3 10 83 4 9 91 5 15 102 6 20 87 7 18 93 8 11 100 9 8 104 10 20 94 11 7 113 12 9 96 13 10 83 14 11 84 15 11 102 16 10 100 17 12 105 18 42 57 19 17 121 20 11 86 21 10 100

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Table of data Pg. 153 Explanatory variable – Age at which first word is spoken Response variable – Gesell Adaptive Score
1. Scatterplot of Gesell Adaptive Scores versus Age at which first word is spoken 10 20 30 40 50 140 120 100 80 60 40 Gesell Adaptive Score Age (in months) at which first word is spoken 19 18

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2. Describe Scatterplot The graph of Gesell Adaptive Scores versus the age at first word for 21 children shows a moderately strong, negatively associated linear relationship. Child #18 and Child #19 have data that stands out as different from the rest of the children.
3. Line of Best Fit In Calculator: Stat, test, LinRegTtest,

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3. Line of Best Fit Cont. Calculate Scroll to the bottom to find r.
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