Random-Digit Dialing (RDD) is a technique used to generate telephone numbers randomly for survey research, allowing access to both unlisted and listed numbers. It ensures a representative sample by ensuring that every possible number has a chance of being selected.
Sampling is a fundamental aspect of fields like marketing research and sales promotion, facilitating the study and testing of small groups to draw conclusions or stimulate usage in larger populations cost-effectively.
Testchecking is a procedure used in auditing to verify the accuracy of certain items in financial records, allowing the auditor to form an opinion about the entire account.
In statistics, the term 'universe' represents all possible elements within a particular set. For example, the universe of shoppers in a country would encompass every individual who engages in shopping activities within that country.
