Discussion
......................... is a preferred sampling method for the population with finite size.
Answer: B
The key gives systematic sampling as the preferred method for a finite population.
In systematic sampling every k-th unit is taken from a complete list of the population, after a random start, with k equal to the population size divided by the sample size. This needs the population to be finite and listed, and in that case it is simple to apply and spreads the sample evenly through the list.
Area and cluster sampling are used when no list of individuals exists and the population is spread over a large region. Purposive sampling is non-probability sampling chosen by the researcher's judgement, so it is not preferred when a full list makes probability sampling possible.
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