English Americans are most introverted, Jewish Americans are least: Here are mean introversion scores for various white American groups:
Mean introversion score (N = more than 20,000)
All ethnicities 14.0*
* p < .05, two-tail test, compared with English/Welsh
The groups with asterisks are significantly more extraverted than Americans of English or Welsh descent. Here are the effect sizes for those who differ significantly:
The differences among whites groups, even at the extremes, are small.
I checked to see if the observed pattern was influenced by immigration. I suspected that immigrants are more introverted than natives, and I was right. If we compare Jews and those of English descent born in America, the effect size increases to .37--a moderate difference.
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