To cross the Bay Bridge in San Francisco, the magic number of riders in a vehicle is three. This allows the car to utilize the carpool lane, thus avoiding clogged freeways and backup at the bridge's tollbooths.

Casual Carpool, a decades-old hitchhiking system, is outdoing Uber, Lyft, and Waze.

According to a transit study concerning people that use Casual Carpool, more than 6,000 people use the system per day.

The median wait time for riders at a Casual Carpool stop is 2 1 2 minutes.

Describe the population and sample for this study scenario.