Researchers (Kubitscheck & Hallinan, 1998) studied the influence of tracking (grouping students by academic ability) on friendship formation. They discovered that tracking fostered ________, which in turn increased the ________ of students "tracked" t

Riots do occur more often on hot days than on cool days (Carlsmith & Anderson, 1979). The hotter the day in a number of cities, the more violent crimes occur (Anderson & Anderson, 1984; Rotton & Frey, 1985). These results suggest that discomfort can lead to aggression. However, such results should be interpreted with caution because

A) the results apply only to urban areas. B) researchers only studied violent aggression. C) researchers only studied instrumental aggression. D) some third variable might account for the relation. E) researchers limited themselves to the United States.

Which of the following complicates the study of personality traits and eating disorders?

A. Personality disorders are always seen in those with eating disorders. B. Personality may be altered by malnourishment. C. Eating disorders may merely be a symptom of a personality disorder. D. Both personality disorders and eating disorders are highly subjective diagnostic categories, thus the collection of empirical data is tainted by the nature of the conditions.