National EMSC Data Analysis Resource Center
When you want to gather information about a group of people such as, “the number of people in ABC town that drive to work everyday,” it would be nice to just observe ALL of the people in ABC town that drive to work, right? You would have exactly the right answer.
Regrettably, in terms of staff, budget, time, and other available resources, it is not usually feasible to observe or question the entire population you are interested in getting information about.
This is where probability sampling comes into play. We'll discuss the following:
Contact NEDARC for help in planning your participation group.