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Sampling is a method of selecting experimental units from a population so that we can make decision about the population. Sampling design is a design, or a working plan, that specifies the population frame,sample size, sample selection, and estimation method in detail. Objective of the sampling design is to know the characteristic of the population.
Three important principles of sampling survey are: 1. Principle of validity 2. Princilpe of statistical regularity 3. Principle of optimization
What guiding principles are you referring to? Please specify and resubmit.
Scientific design is always better.
They include: Simple random sampling, Systematic sampling, Stratified sampling, Quota sampling, and Cluster sampling.