Scatter plots indicate a violation of one or more of the assumptions of linear regression
A residual scatter plot is a graphic that displays two axes: one for expected scores and one for prediction errors. An first visual inspection of the data set can identify any outliers, sometimes referred to as extreme scores.
A scatter diagram has at least one outlier if one of its points is farther away from the regression line than another. Each of these points is an outlier if two or more of them have the same maximum deviation from the regression line (this is unusual).
Learn more about scatter plots here:
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