NULL Hypothesis: The ratio of riders who are over 30 years old biking on weekends over the weekdays is the same or higher than the ratio of riders who are under 30 years old biking on weekends over biking on weekdays.
In formulas:
H_0: frac{{under30{weekend}}{under30{{week}}} <= frac{over30{weekend}}{over30{week}}
H_1: frac{under30{weekend}}{under30{week}}} > frac{over30{weekend}}{over30{week}}