the scoring in hockey/soccer is much more random than in say football or baseball. those sports allow for more incremental progress and strategy, sort of like chess.
even in hockey i'm assuming skill would be a major factor it's just whatever league the study was done on probably had a relatively standard level of skill throughout its teams... not to say there wasn't variation but say in a pro league or something like that of any sport you will only get people from within a certain skillset. i guarantee if you tried to get a random group of unskilled hockey players to play against an expert team 100 times in a row you wouldn't be looking at the same kind of ratio you would look at if you flipped a coin 100 times.
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