Final answer:
A survey is a structured interview method used to collect data from individuals or groups. Valid survey results require meeting criteria such as identifying the desired population and using a random and representative sample.
Step-by-step explanation:
A survey is a structured interview in which respondents are all asked the same questions and their answers are tabulated and interpreted. It is a widely used scientific research method to collect data from a large number of individuals or groups. To ensure valid survey results, several criteria must be met, including identifying the desired population, building a random and representative sample, and informing subjects about the nature and purpose of the survey.