Unformatted text preview: the point: (x-bar, y-bar) “Total variation in y” measures the variability of the y's about their mean y-bar. 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: (x-bar, y-bar)...
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- Winter '11