## Residual Normal QQ Plot

A normal quantile-quantile plot of residuals is illustrated
by the plot on the right in Figure 39.25.
See the "Residual Normal Quantiles" section
for an explanation of the **X** axis variable.
The empirical quantiles are plotted against the
quantiles of a standard normal distribution.
If the residuals are from a normal distribution
with mean 0, the points tend to fall along the
reference line that has an intercept of 0 and a
slope equal to the estimated standard deviation.

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