In regression analysis,the presence of a residual plot exposes a departure from linearity.

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A residual plot, which displays the residuals on the vertical axis and the independent variable on the horizontal axis, helps in identifying non-linearity. If the residuals are randomly dispersed around the horizontal axis, a linear regression model is appropriate. However, if the residuals display a pattern (e.g., curved), it indicates a departure from linearity, suggesting that the linear model may not be the best fit for the data.

In Regression Analysis,the Presence of a Residual Plot Exposes a Departure