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
Picking every 5th or 10th unit at regular intervals is:
assistant
The correct answer is  A systematic sample is obtained by selecting one unit at random and then selecting additional units at evenly spaced interval till the sample of required size has been achieved.