system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Random sampling is not done in?
assistant
The correct answer is  Quota sampling is a method for selecting survey paicipants that is a non-probabilistic version of stratified sampling. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 913