In this, first, we divide the population into clusters. Next, we pick a random sample of these clusters to form our sample. If your subjects are sporadic, spread over a large geographical area, cluster sampling can save your time and be more prudent financially. Here are the stages of cluster sampling:
Sampling frame – Choose your grouping, like the geographical region in the sampling frame.
Tag each cluster with a number.
Perform a random selection of these clusters.