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Regression lines as a way to quantify a linear trend. Residuals at a point as the difference between the actual y value at a point and the estimated y value from the regression line given the x coordinate of that point.

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AP Statistics on Khan Academy: Meet one of our writers for AP¨_ Statistics, Jeff. A former high school teacher for 10 years in Kalamazoo, Michigan, Jeff taught Algebra 1, Geometry, Algebra 2, Introductory Statistics, and AP¨_ Statistics. Today he's hard at work creating new exercises and articles for AP¨_ Statistics.

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