Figure2. Fraction of Citibike bikers born/after 1980 for week days (left) and weekends (right)
Conclusions
According to my calculation result in python. The Z statistics is -48.35. In this case, we need to reject the Null Hypothesis. The weakness of this miniproject is the sample. Our data is only one month data which cannot represent the whole year or a longer time. The strengths of the analysis is easy to realize.