In order to reduce the cost of sampling, the cluster sampling should be applied.
Cluster sampling is a form of sampling techniques whereby the population that the researcher wants to study are divided into smaller groups which are called clusters.
Based on the question asked, since the the cost of sampling will be high for the entire population, the population can be divided into clusters after which the required people will be selected. This will help in reducing the cost.
In conclusion, the statistical sampling techniques that should be applied is the cluster sampling.
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