Use the Normal Quantile Plot option to visualize the extent to which the variable is normally distributed. If a variable is normally distributed, the normal quantile plot approximates a diagonal straight line. This type of plot is also called a quantile-quantile plot, or Q-Q plot.
The normal quantile plot also shows Lilliefors confidence bounds (Conover 1980) and probability and normal quantile scales.
Figure 3.7 Normal Quantile Plot
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The y-axis shows the column values.
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The upper x-axis shows the normal quantile scale.
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The lower x-axis shows the empirical cumulative probability for each value.
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