Much attention has recently focused on the incidence of concussions among athletes. Separate samples of soccer players, non-soccer athletes, and non-athletes were selected. The accompanying table then resulted from determining the number of concussions each individual reported on a medical history questionnaire ("No Evidence of Impaired Neurocognitive Performance in Collegiate Soccer Players," Amer. J. of Sports Med., 2002: 157-162).

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# of Concussions 0D 10 Soccer N-S Athletes Non-athletes 45 68 45 25 15 0