What is the effect of concussions on the brain? Researchers measured the brain sizes (hippocampal volume, in microliters) of 25 collegiate football players with a history of clinician-diagnosed concussion and 25 collegiate football players without a history of concussion. The summary statistics are given in the table. Group Concussion No concussion Group Size 25 25 Mean Standard Deviation 5784 6489 609.3 815.4 Rashmi Singh et al. Relationship of collegiate football experience and concussion with hippocampal volume and cognitive outcomes. JAMA. 2014, 311, 1883-1888.

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