Abstract
66 female college students rated themselves and their peers on extraversion and filled out the Eysenck Personality Inventory (EPI) and the California Psychological Inventory (CPI). The group was dichotomized into Introverts and Extraverts on the basis of their self-ratings and their extraversion scores. Self-rated Introvert and Extravert criterion groups were significantly different from each other and from the total group on Extraversion score and Introvert and Extravert groups as determined by Extraversion score were significantly different from each other and from the total group on the basis of self-ratings, thus supporting the validity of the extraversion scale. Correlations of scores on the EPI and the CPI support the validity of the extraversion and neuroticism scales.
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