Essentialist beliefs about essentialist beliefs
Most people don't understand statistical ideas like distribution, correlation, and regression. And even if they understand these concepts, they often find them too complicated for everyday thinking, or impractical for everyday communication. So instead they fall back on essentialist beliefs and generic statements.
For example, "The lower classes are not merely unfortunate, according to the upper classes; they are genetically inferior". This statement attributes a belief about one generic category ("the lower classes") to another generic category ("the upper classes"). It might be someone's subjective assessment based on personal experience, but in this case it's a journalist's description of the results of a series of psychological experiments, describing the fact there was a significant correlation (and a significant multiple-regression coefficient) between a "social class rank" variable and an "essentialist beliefs about class" variable. And as generic statements often do, it risks leaving readers with misleading ideas about the experiment and about the attitudes that it tested.
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