In an Experiment on Teen Aggression and Violent Video Games

Multiple Choice

In an experiment on teen aggression and violent video games, some teens were driven to the study by their parents, while others drove themselves. It turned out that participants who were driven by their parents were generally more angry when they arrived (and thus exhibited a stronger relationship between aggression and video games) , compared to participants who drove themselves. The issue of transportation to the study represents what potential problem?

A) random error
B) systematic error
C) sampling error
D) selection error