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To forecast four-year, two-year, and single-course grades in college, a California Psychological Inventory (CPI) equation (30.60 - .26Wb + .35Re -. l9Gi + .39Ai + .22Ie + .36Py) was developed. Cross-validational coefficients for scores on the equation were .38 for 326 males and .36 for 570 females.
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Gough et al. (1986) studied this question.
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