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Regarding Cronbach's $\alpha$, Wikipedia writes: It has been proposed that $\alpha$ can be viewed as the expected correlation of two tests that measure the same construct. Note that correlation is a nonparametric concept. Its definition is independent on the functional form and functional relationship of the two variables. There are numerous ways to ...


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There are a number of findings showing that people who are low in agreeableness swear more often. Apologies for the long full quote, but the relevant literature has just recently been nicely reviewed in a chapter about "Natural language use as a marker of personality" by Ireland and Mehl (2014). They cite the study you based your question on (Mehl, Gosling, ...


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Some claims on personality correlations to physical activity: Extraversion is a trait that keeps showing up here. "Previous studies examining correlates of leisure time physical activity (LTPA) (...) Higher standing on Activity and Discipline and lower standing on Assertiveness predicted greater odds of engaging in LTPA and longer duration of LTPA, ...


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As a starting point, you might be interested in studies that have related vocational preferences with personality. In particular, Holland's model of job preferences has been highly studied. Practical sense sounds a little like the "realistic" dimension in Holland's framework. Larson et al (2002) report a meta-analysis of the Big 5 and Holland's types. ...



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