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Examining Distributions

Creating the Distribution Analysis

The distribution of a variable is the pattern of variation of its numerical values (Moore and McCabe 1989). In this example, you examine a distribution of scores on the mathematics portion of the SAT exam.


Open the GPA data set.


Select the variable SATM by clicking on its name in the data window.

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Figure 12.2: Data Window with SATM Selected


Choose Analyze:Distribution ( Y ).

[menu]
Figure 12.3: Analyze Menu

This creates a distribution window, as shown in Figure 12.4. A box plot, histogram, Moments table, and Quantiles table appear by default. With these graphs and tables, you can examine important features of a distribution.

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Figure 12.4: Distribution Analysis


Box Plot

Histogram

Moments and Quantiles Tables

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