Introduction

Citi Bike, introduced to New York City in 2013, is a privately owned bike-share system expanding throughout the boroughs of the City. Since its inception, use of the bike share system has grown significantly, which has led to our inquiry into the average age of male and female riders and whether there is a significant difference between the two.
The marketing rationale worth exploring is the gender differences that may impact customer base. Citi Bike as a service wants to reconcile the reasons for restrictions in user uptake. If some users are not willing to use the service, there is a market expansion potential. For example if user disparities are based on perception of rider safety, proximal access, or income based preferences, these present potential market expansion opportunities for Citi Bike.

Data

We considered one month of data, July 2017, dropping extraneous observed variables so that the only two that remained were relevant to our research: birth year and gender. We subtracted birth year values from 2017 in order to determine the age of each rider. The data contained a few unrealistic observed ages that were likely incorrect or misreported (one rider was listed as being 143 years old), so we removed all far outlying data points with an observed age greater than 79.