The sampling method used is classified as Systematic.
How are sampling strategies classified?
Samples may be classified as:
- Convenient: Drawn from a conveniently available pool.
- Random: All the options into a hat and drawn some of them.
- Systematic: Every kth element is taken.
- Cluster: Divides population into groups, called clusters, and each element in the cluster is surveyed.
- Stratified: Also divides the population into groups. Then, a equal proportion of each group is surveyed.
In this problem, every 4th element is taken, which is a systematic sample with k = 4.
More can be learned about sampling at https://brainly.com/question/25122507
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