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Mb0050 Q3.b. Analyze multi-stage and sequential sampling.

Answer: b. Multi-stage sampling is carried out in two or more stages. The population is regarded as being composed of a number of second stage units and so forth. That is, at each stage, a sampling unit is a cluster of the sampling units of the subsequent stage.

Sequential sampling: Double sampling refers to the subsection of the final sample form a preselected larger sample that provided information for improving the final selection. When the procedure is extended to more
than two phases of selection, it is then, called multi-phase sampling. This is also known as sequential sampling, as sub-sampling is done from a main sample in phases. Double sampling or multiphase sampling is a compromise solution for a dilemma posed by undesirable extremes. “The statistics based on the sample of ‘n’ can be improved by using ancillary information from a wide base: but this is too costly to obtain from the entire population of N elements. Instead, information is obtained from a larger preliminary sample nL which includes the final sample n.

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