Fit a linear function to data when a scatter plot suggests a linear association.
Compare possible lines of fit
Problem
Determine the better line of fit for upward linear scatter when line A balances points with small random residuals and line B lies above most points. Justify the decision using fit criteria.
Matching the trend’s direction is only the first test for a fitted line. A stronger fit runs through the center of the point cloud and leaves residuals small and roughly balanced above and below zero; a line with points mostly on one side carries systematic bias even if its slope looks reasonable.
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