Methodology
I adopted Z-Test to test my hypothesis. Compared to T- Test, Z-test is more suitable to large amound of sample (n > 30). T-test is more often be used to analyze the sample data which smaller than 30. The sample size in this analysis is larger than 250000 so I prefer Z- test.
\(P_0=\frac{B_{Weekend}}{B_{Total}}\) (1)