Some possible explanations for this outcome include that: (a) people don't use Citi Bike for leisure; (b) the 30- and 45-minute constraints on each ride before charging extra money limit the duration of each trip, in other words, people could be riding longer trips by switching bikes; (c) people don't ride bikes for leisure on cold snowy days. It turns out the null hypothesis is successfully rejected in the data set from July 2017.