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However, it may save costs on obtaining a sample. Cluster sampling is a two-step sampling procedure. It may be used when completing a list of the entire population is difficult. For example ...

The data set Customers contains an Internet service provider's current subscribers, and the service provider wants to select a sample from this population for a customer satisfaction survey. This example illustrates replicated sampling, which selects ...

A population is divided into groups that share characteristics called strata for stratified random sampling. Proportional stratified random sampling involves taking random samples from stratified ...

Thus far, most discussions concerning the methods used for sampling have focused on sampling requirements outside of the laboratory; for example ... sample and simple random sampling procedures ...