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This figure is similar to Figure 2, but in this case, the displacement of groups on IQ is opposite what would be expected given the overall positive correlation between IQ and Memory in both groups. The two solid horizontal lines show the difference in the conditional (i.e., adjusted) means. The separation between the two dashed horizontal lines shows the difference in the unadjusted means, which are also referenced by the centers of the marginal distributions for Memory.
