After comparing with Dr.Bianco's testing for New York City's Prison Employment Program Effectiveness, Chi-squared test was selected as the . The Citibike project are looking at probabilities of two categorical data and therefore, Chi-square measures whether significant differences exist between the expected probability and the observed probabilities in one or more categories. As the result showing below, the Chi-Square value is way larger than 3.84 (chi-square value corresponding to 0.05 significance level). Therefore, the null hypothesis can be rejected.