The prevalence and patterns of knee injuries among women collegiate rugby players were investigated using a sample questionnaire, to which 42 rugby clubs responded.20 A total of 76 knee injuries were classified by type as well as the position (forward or back) of the player.
Chi-Square Test: Men Tear, MCL Tear, ACL Tear, Patella, PCL Tear
Expected counts are printed below observed counts
Chi-Square contributions are printed below expected counts
Chi-Sq = 3.660, DF = 4, P-Value = 0.454
4 cells with expected counts less than 5.0
a. Use the MINITAB printout to determine whether there is a difference in the distribution of injury types for rugby backs and forwards. Have any of the assumptions necessary for the chi-square test been violated? What effect will this have on the magnitude of the test statistic?
b. The investigators report a significant difference in the proportion of MCL tears for the two positions (P < .05) and a significant difference in the proportion of ACL tears (P < .05), but indicate that all other injuries occur with equal frequency for the two positions. Do you agree with those conclusions? Explain.
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