Site gives detailed information for constructing a least squares regression line.
Stat Trek.com
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Interactive applet that allows a student to plot points on a graph and see how an outlier affects the regression line of the data points.
Illuminations NCTM
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Very comprehensive list of statistics formulas.
Stat Trek
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Site has defintion and explanation of the least squares regression line as well as links to additional resources.
Carlton College Statistics
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Least Squares
Wolfram MathWorld
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