Outlier Effects On a Regression Line
What is the typical effect on a least-squares regression line of an outlier with an unusually low response value for its corresponding -value?
A
It causes the regression line to become perfectly horizontal.
B
It increases the strength of the positive correlation.
C
It has no effect on the regression line if it is not leveraged by .
D
It tends to pull the regression line downward, potentially reducing the slope.
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