Cluster sampling and area sampling: Cluster sampling involves grouping the population
and then selecting the groups or the clusters rather than individual elements for inclusion in
the sample. Suppose some departmental store wishes to sample its credit card holders. It
has issued its cards to 15,000 customers. The sample size is to be kept say 450. For cluster
sampling this list of 15,000 card holders could be formed into 100 clusters of 150 card
holders each. Three clusters might then be selected for the sample randomly. The sample
size must often be larger than the simple random sample to ensure the same level of
accuracy because is cluster sampling procedural potential for order bias and other sources
of error is usually accentuated. The clustering approach can, however, make the sampling
procedure relatively easier and increase the efficiency of field work, specially in the case
of personal interviews.