An equation to predict teaching effectiveness from the California Psychological Inventory (CPI) was developed on a sample of 293 students (215 females, 78 males). The equation included scales for socialization, good impression, achievement via conformance, psychological-mindedness, and flexibility, combined in this form: 14.743 + .334So -,670Gi + .997Ac + .909Py -.446Fx. Cross-validation of the equation on 17 higher-rated vs. 17 lower-rated student teachers gave a t ratio of 4.27 (p < .001), and a biserial correlation of +.44. Conceptual analysis of the dimension defined by the equation suggested personological bases of conscientiousness vs. undercontrol of impulse for males, and of resoluteness versus indifference for females.
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