Offender surveys are questionnaires given to the general public or to a more specific group of known offenders to find out about crimes that may or may not be on record
The nature vs nurture debate is about whether people are born with certain traits or behaviours (nature) or whether it is a result of their experiences (nurture)
The Cooper & Mackie study aimed to see whether video games had more effect on violent behaviour than TV, and whether there were any gender differences in the effects
Participants in the aggressive game condition spent more time playing with the aggressive toy than participants who played one of the other games, and this was truer of girls than boys
The study used independent means so it is possible that the violent video game condition showed higher levels of aggression because of the individuals who happened to be allocated to that group