Personalities of cocaine abusers. Do cocaine abusers have radically different personalities than nonabusing college students? This was one of the questions researched in Psychological Assessment (June 1995). Zuckerman– Kuhlman’s Personality Questionnaire (ZKPQ) was administered to a sample of 450 cocaine abusers and a sample of 589 college students. The ZKPQ yields scores (measured on a 20-point scale) on each of five dimensions: impulsive–sensation seeking, sociability, neuroticism– anxiety, aggression–hostility, and activity. The results are summarized in the accompanying table. Compare the mean ZKPQ scores of the two groups on each dimension, using a statistical test of hypothesis. Interpret the results at α = .01.
Cocaine Abusers (n = 4502 | College Students (n = 5892 | |||
ZKPQ Dimension | Mean | Std. Dev. | Mean | Std. Dev. |
Impulsive–sensation seeking Sociability Neuroticism–anxiety Aggression–hostility Activity
| 9.4 10.4 8.6 8.6 11.1 | 4.4 4.3 5.1 3.9 3.4 | 9.5 12.5 9.1 7.3 8.0 | 4.4 4.0 4.6 4.1 4.1 |
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