# A survey of students living in a high-rise residence is to be conducted. The residence has 10 floors, 20 rooms per floor, and 2 people per room. What type of sampling method is used if 2 floors are randomly selected and every student on each of those floors is surveyed?

A survey of students living in a high-rise residence is to be conducted. The residence has 10 floors, 20 rooms per floor, and 2 people per room. What type of sampling method is used if 2 floors are randomly selected and every student on each of those floors is surveyed?
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When the population consists of mutually homogenous but internally heterogeneous groups. A sampling technique used in such a situation is cluster sampling. In cluster sampling clusters are randomly selected as samples and then all the units of each selected cluster are surveyed.
In the given situation, the 10 floors can be considered as mutually homogenous groups or clusters, that are interchangeable yet are internally heterogeneous. Therefore, for the present situation, cluster sampling is used where the floors are clusters and randomly clusters are selected such that each unit of the cluster is surveyed.