It belongs to isometric sampling or systematic sampling in every fifth adult entering an airport is checked for extra security screening.
What is systematic sampling?
Systematic sampling is a type of probability sampling method in which sample members from a larger population are selected according to a random starting point but with a fixed, periodic interval. This interval, called the sampling interval.
Security workers at an airport randomly choose one of the first 50 people to pass through a checkpoint for extra security screening.
After that person, they choose every 50th person who passes through for extra screening as well
By the topic
The sampling interval is 50, which is periodic.
It belongs to isometric sampling or systematic sampling.
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