What has been associated with high levels of aggression?

Brandon is an abused child. According to statistics, who is most likely to be his abuser?

A) his father B) his mother C) his older sister D) his older brother

What is the scientific purpose of conducting a field study, such as the one conducted in study 4?

A) to observe risk behaviors in the context in which they often occur B) to allow laboratory studies and field studies to be conducted simultaneously C) to observe the effect of college students' alcohol consumption habits on subsequent effectiveness of pick-up lines D) to observe college students' ordinary sexual behaviors without the confounding presence of alcohol