Ewa Is an Athletic Trainer at the University

Multiple Choice

Ewa is an athletic trainer at the university. She conducts research on violence in sport. She has designed a study to examine the effects of a new sportsmanship class. She randomly assigns teams by sport to be in either her new class or not. That is, some teams are in the class and others are not. She then compares incidents of violence between groups. What is one threat that Ewa must be particularly concerned about?

A) Instrumentation
B) Mortality
C) Selection
D) History