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Definitions for cluster sampling. Cluster sampling. Cluster sampling is a sampling technique used when natural but relatively homogeneous groupings are evident in a statistical population. It is often used in marketing research.
Systematic sampling. In systematic sampling, individuals or households are chosen at regular intervals from the sampling frame. For this method we randomly select a number to tell us where to start selecting individuals from the list. For example, a systematic sample is to be selected from 1,200 students at a school. The sample size selected is 100. The sampling fraction is 1200/100. The sampling interval is therefore 12. The number of the first student to be included in the sample is chosen randomly, for example, by blindly picking one out of 12 pieces of paper, numbered 1 to 12.