Much attention has recently focused on the incidence of concussions among athletes. Sepa...

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).

Does the distribution of # of concussions appear to be different for the three types of individuals? Carry out a test of hypotheses using the P-value approach.