A city roads department in Ottawa would like to repair some potholes on the busiest section of a road. The best way to do the repair is when the flow of traffic is low to avoid traffic congestion and inconvenience for drivers. Practically, it would be expen- sive and time consuming if not impossible to monitor and record the traffic flow on every day. It was decided to record how many vehicles pass on this section of road during one particular day. Using this data information, the department decides when to repair the potholes. Note that in this example, population constitutes all the automobiles that flow on all days on that section of the road and the sample is defined as the automobiles that passed on that section of the road on the particular day.