Epidemiology can use census data or survey data.

Epidemiology can use census data or survey data. Epidemiologists would love to have a complete count of everyone (census), and sometimes we need to go find and interview everyone who is exposed to a certain event. However, when describing large population trends, most often we rely on representative samples of the population to give us an indication of how big of a proportion of people are sick or at risk.

On the job, you will often be asked to provide or retrieve information. A good practice is to confirm the intended purpose and the type of data you are expected to provide before responding. You should also provide confirmation of your sources when you respond to the request.

• This exercise is about what you can or cannot say when you are given certain data. Be careful to consider which aspect of the data you would use to make policy recommendations.
• Each of Centervale's three townships—Simon Township (ST), Diamond Township (DT), and Taylor Township (TT)—is responsible for traffic safety in the unincorporated areas, including maintenance and installation of roads, sidewalks, bike trails, lighting and traffic signs and lights, and snow removal. As Centervale grows and expands rapidly, with an out-migration of young families and retired couples from Metropolis, more reports of traffic accidents are appearing in the media.