Methodologies

As suggested by the peer review process, the proportion z test is proposed to perform on the dataset. Since the tests is supposed to show whether the one proportion is  significantly higher than the other. A one-tail Z test will make sense for the and it is a one-tail test for female riders proportion should be higher than the male proportion. The chi-square proportion test is also a sensible choice for testing the difference in proportion. The proportion of the female riders over age fifty is calculated by dividing the total female population by the female riders who is born between 1931 and 1966. And the male proportion is calculated likewise. Refer to Fig. 2 and Fig.3 for the plotted percentage of female and male riders by their birth year.