Hockey	Football	Row Totals
Evidence of brain trauma	15	61	76
No clinical evidence of brain trauma	54	21	75
Column Totals	69	82	151

Suppose the above table summarizes some results of a study regarding brain trauma which looked at clinical evidence of brain trauma across hockey players and football players.

Based on this data, playing football over hockey increases the risk of brain trauma by about 53%.

Responses

valid

valid

invalid