Survey data collectionWith the application of probability sampling in the 1930s, surveys became a standard tool for empirical research in social sciences, marketing, and official statistics. The methods involved in survey data collection are any of a number of ways in which data can be collected for a statistical survey. These are methods that are used to collect information from a sample of individuals in a systematic way. First there was the change from traditional paper-and-pencil interviewing (PAPI) to computer-assisted interviewing (CAI).
Popular sovereigntyPopular sovereignty is the principle that the authority of a state and its government are created and sustained by the consent of its people, who are the source of all political power. Popular sovereignty, being a principle, does not imply any particular political implementation. Benjamin Franklin expressed the concept when he wrote that "In free governments, the rulers are the servants and the people their superiors and sovereigns".
