After doing the z-test for two proportions, we found that our hypothesis was justified. So regardless of men riders outnumbering women riders, women are more willing to bike at morning, which Citibike company could attach importance to if they tried to lure more women subscribers.
Data
The datasets used for the test was 201706 Citibike
dataset within the CUSP data facility (DF), which we could easily access working on NYU CUSP compute platform. Then I used iPython notebook to process my datasets (you could access the original notebook file click on the upper left side of Figure 2).