The normal plot is a residual plot that checks the assumption that,for any point in the experimental region,the population of potential error terms is normally distributed.

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The normal plot, also known as a Q-Q plot or quantile-quantile plot, is a graphical tool used to check for normality in the distribution of residuals. It compares the distribution of the residuals to a theoretical normal distribution. If the residuals are normally distributed, the plot will show a straight line pattern. Therefore, the normal plot helps to verify the assumption that for any point in the experimental region, the population of potential error terms is normally distributed.

The Normal Plot Is a Residual Plot That Checks the Assumption