Question
What is sampling? Give its classification and explain the concept of stratified, cluster, random and purposive sampling.
Answer :
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Sampling is a process used in statistical analysis in which a predetermined number of observations are taken from a larger population. The methodology used to sample from a larger population depends on the type of analysis being performed, but may include simple random sampling or systematic sampling.
Cluster sampling
A visual representation of selecting a random sample using the cluster sampling technique
Sometimes it is more cost-effective to select respondents in groups ('clusters'). Sampling is often clustered by geography, or by time periods. (Nearly all samples are in some sense 'clustered' in time – although this is rarely taken into account in the analysis.) For instance,
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