Introduction
Citi Bike is a bike-sharing system operated in New York City and Jersey City. Users register their information then are able to borrow and return bikes at fixed bike stations\cite{city}. The idea of this system was brought up by the New York City Department of Transportation in 2008 and implemented by Citigroup in May 2013\cite{program}. By October 2017, the number of stations has increased from 332 to 706, while the number of bikes has increased from 6000 to 12000. The annual subscribers has reached 115,000. In 2016, riders took more than 14 million trips\cite{oconnell2017}. To make sure the number of bikes in stations accords with the user's demand, the user's behavior is crucial for rearranging bike distribution, designing bike station size and other issue related to citi bike maintainance services. This research analyzes whether trip duration differs from male riders to female riders using a Mann Whitney U test. Based on the result, male and female riders' trip duration follow different distributions, which provides a valuable aspect for Citigroup to inspect the user behavior and customize regulations based on gender differences.
Data
Citi Bike's data set contains users' information, trip describtion such as trip duration, start station, end station for each trip. This research uses data in January 2015.