Introduction
Citi Bike is New York City’s bike share system, and the largest in the nation. Launched in May 2013, Citi Bike had become an essential part of US metropolitans' transportation network \cite{nyca}. Citi Bike is providing data that is open to the public, inviting developers, engineers, statisticians, artists, academics and other interested people to use the data for analysis, development, visualization and trends discovering for any question regarding users profile, ride habits and more \cite{nyca}. Our research relies on common assumption that women probably ride more during daytime, in comparison to the differences between daytime and nighttime rides of men. This kind of understanding the different habits of the genders could contribute to the understanding men and women mobility / dynamics in the city.
Our research question, null and alternative hypotheses:
Q: