According to Basic Concepts of Sampling (n.d.) the purpose of sampling is to provide various types of statistical information that is qualitative or quantitative in nature about the whole group by examining a few selected units. The sampling method on the other hand is the scientific procedure of selecting those sample units which would provide the required estimates with associated margins of uncertainty (Basic Concepts of Sampling). What do you see as the advantages and disadvantageous of sampling?
The major advantages of sampling are that it ensures convenience, time and cost savings, higher accuracy of data collection, collection of intensive and exhaustive data, suitability in limited resources and better rapport. The reliability of the sample depends upon the appropriateness of the sampling method used. But the real difficulties lie in selection, estimation and administration of samples. Disadvantages of sampling include chances of bias, difficulties in selecting truly a representative sample, need for subject specific knowledge, changeability of sampling units and near impossibility of random sampling.
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