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Researchers have long identified a link between violent video games and aggression

Psychology

Researchers have long identified a link between violent video games and aggression. The assumption is typically that the video games lead to an increase of aggression, but it is possible that aggressive individuals are more likely to choose violent games. We recruited volunteers from a local high school to participate, and we purposefully recruited an equal number of males and females. We excluded students who had a school disciplinary record suggesting aggression. The remaining participants were randomly assigned to an aggression-inducing situation or a control, and then given a violent video game to play but given the choice of how long to play it. Those who were in the aggression-inducing situation played the violent video game for a significantly longer time than those in the control.
1. Is this an abstract for a primary research article? Explain your answer.
2. Explain at least one ethical concern that should be justified to an IRB before this study could be conducted. Remember, ethical concerns are ONLY relevant to whether there is potential for harm or discomfort to the participants (people) or subjects (animals) in the study.
3. Does excluding students with a disciplinary record increase or decrease the study's external validity? Does it increase or decrease internal validity? Explain both answers.
4. What is the DV? What is the scale of measurement for the DV?
5. What is the IV? Give an example of a possible operational definition for the IV. 

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