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Insert after "The least-squares method finds the optimal parameter values by minimizing the sum of squared residuals:"
To the right is a residual plot illustrating random fluctuations about , indicating that a linear model is appropriate. If the residual points had some sort of a shape and were not randomly fluctuating, a linear model would not be appropriate.
The residuals are plotted against corresponding values. The random fluctuations about indicate a linear model is appropriate.
