Last night David Ortiz (of the Boston Red Sox) cited the high amount of day games the Cubs play as the reason their performance is consistently poor. I sought to check whether their results in day games actually back this theory.
I went back 6 years to 2009, the year after they last made the playoffs. They actually played better in day games: in day games, they had a win percentage of 0.452, and in night games, 0.429. Hypothesis testing that day games are worse for the Cubs than night games resulted in a p-value of 0.2389: meaning that there's only a 23.89% chance Ortiz is correct, although we can't definitively conclude he's wrong either.
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