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
Non - sampling errors may occur due to all the following except-
assistant
The correct answer is  Errors may occur not only due to error in sample survey but also due to inadequately calibrated instruments, observer variation, incomplete coverage, and conceptual errors. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 913