The sampling technique used by the football coach is cluster sampling.
A population is divided into groups, such as areas or schools, and some of these groups are randomly chosen as your sample via the probability sampling technique known as cluster sampling. In a perfect world, each cluster would be a tiny reflection of the entire population.
Professionals and organisations involved in marketing frequently use cluster sampling. Due to the enormous population sizes, cluster sampling is recommended when attempting to examine a city, town, or district's demographics.
Cluster sampling uses less resources because it just chooses specific groups from the total population. Therefore, because it requires less administrative work and travel, it is typically less expensive than simple random or stratified sampling
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