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Unformatted text preview: the point: (xbar, ybar) Total variation in y measures the variability of the y's about their mean ybar. If the value of x tells us nothing about the value of y, then r^2 = 0. The purpose of a residual plot is to diagnose problems with the regression equation assumptions. The least squares regression line always intersects the point: (xbar, ybar)...
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 Winter '11
 PattiColling
 Correlation

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