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Averages, standard deviations, and variance ratios of the distributions of 
| Normal | Upper | Middle | Lower | |
|---|---|---|---|---|
| Average | −0.174 | −0.007 | −0.006 | 0.006 |
| Standard deviation | 0.143 | 0.094 | 0.075 | 0.089 |
| Variance ratio | Upper | 1.58 | 1.13 | |
| Lower | 1.40 |
Normal, Upper, Middle, and Lower correspond to the distributions in Fig. 8, a, c, e, and g. The critical value for a two-sided F-test with 5% reliability and (149, 149) degrees of freedom is 1.38.
