The athletic director of a high school football conference is concerned about the incidence of injury. He suspects that playing on artificial turf is a likely source of injury, as well as the year of the player in high school. Due to differences in growth and strength, he reasons that younger players are more likely to receive injuries than older players. After the first game of the year, he tabulates the following data for all players who played in games.

Analyze these data for the athletic director.

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Game Surface Grass 131 13 Artificial Turf 146 32 Injury No Yes First Two Years in High SchoolSecond Two Years in High School Game Surface Game Surface njuryGrass Artificial Turf Injury Grass Artificial Turf 0 57 57 0 79 89 es 14 es 18