The final result of Z score is calculated as 138.93, which is much larger than the largest the largest number reported in  Z stats tables, 3. In the Z stats table, Z=3 corresponds to a p value < 0.0002, hence the p value corresponding to the calculated result must be much smaller than the chosen significant level alpha = 0.05. Therefore, We can reject the null hypothesis that The ratio of man biking at night over man biking during the whole day is  the same or less than the ratio of woman biking at night to woman biking during the day. We can conclude that women are less likely than men to choose biking during the night (9:00pm - 6:00am).
The weakness of this project is that the size of the data set chosen for the analysis is small, covering only one month in 2017. This is due to some objective constraints such as the limitation of computing capability of hardware used.