Demographics, or the study and analysis of demographic information, attempts to learn more "about the population of a region and the culture of the people there." As the characteristics of a group of people are altered to study different demographic profiles, the opinions expressed by different groups will change due to the impact of those characteristics.
For example, a researcher may want to study how different groups of people feel about the need for revisions to the process of providing health care to residents of the United States. The researcher may decide to categorize persons to be contacted for data to be used in this study as 1) under age 25, high school graduate, male, head of household with dependents; 2) age 35-45, college graduate, female, head of household with dependents; 3) age 60-70, college graduate, male, physically disabled.
These three groups have very different demographic characteristics, and their needs and opinions about health care will probably reflect the vast differences. A young person will react to the topic quite differently than an older person; someone who has dependents will have different needs than someone without children or aged parents requiring health care assistance.