An officer was tasked to determine the total number of laboratory rooms in need of repair. By drawing lots, ten buildings were randomly selected and all laboratory rooms in each selected building were inspected.What sampling method was used in selecting the building? (Choices: simple random; stratified random; systematic; cluster)What sampling method was used in selecting the laboratory rooms? (Choices: simple random; stratified random; systematic; cluster)

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Ben Reese · Accepted Answer

Given that An officer was tasked to determine the total number of laboratory rooms in need of repair. By drawing lots, ten buildings were randomly selected and all laboratory rooms in each selected building were inspected.We have to write What sampling method was used in selecting the laboratory rooms. In simple random sampling we randomly select some specified number elements from the population. In systematic sampling we select a sample of elements from a population using a fixed interval from a random start. In stratified sampling, we divide the whole population into strata such that the element within each strata are homogenous to each other. Than we select a random sample from each strata. In Cluster sampling we divide the whole population into group of clusters, than we randomly select some clusters and than we take all the elements from the selected clusters. So, here Cluster sampling is used. i.e., option D is correct.

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