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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Characteristics of a Chi-Square Distribution

We can see from Figure 18.2 that the chi-square distribution is not symmetrical but rather has a positive skew. The shape of the distribution will change with the number of degrees of freedom as shown in Figure 18.3.
 
As the number of degrees of freedom increases, the shape of the chi-square distribution becomes more symmetrical.
Figure 18.3
Family of chi-square distributions.
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