The data used was the months of January and February for the year 2016 and 2017 and the test used was the Z test for proportions.
Future addition: the result of the analysis

Introduction

In an effort to reduce emissions, road wear, collisions, and road and transit congestion and to improve public health, the New York City Department of Transportation (NYCDOT) researched alternative forms of transportation, publishing a strategic plan in 2008. According to NYCDOT statistics, 56% of all automobile trips within the city are under 3 miles (4.8 km) (with 22% under 1 mile (1.6 km) and 10% under 0.5 miles (0.80 km)), well within distances readily served by bicycle. To encourage residents to use bicycles more, the city committed to expanding bike lane miles, bike racks, and bike-parking shelters, thus setting the stage for the formation of Citibike. (Reference wikipedia here)

Data

The monthly Citibike data for the months January and February for the year 2016 and 2017 was taken from this link: