Introduction
Citibike launched in Manhattan in 2013 and has since expanded to the outer boroughs over the past 5 years. While Citibike is a great transportation alternative for New Yorkers, the official Citibike website is also targetting tourists, and has recently introduced a one-day and three-day pass for them. I've looked the Citbike ridership data from May 2016 to see if the fraction of rides taken by tourists on weekends is significantly higher than the fraction of tourists using this service on weekdays. Below is the hypothesis I am testing at significance level 0.05.
NULL HYPOTHESIS
The fraction of customers biking on weekends is the same or lower than the fraction of those biking on weekdays.
ALTERNATIVE HYPOTHESIS
The fraction of customers biking on weekends is the greater than the fraction of those biking on weekdays.