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Limitations and Alternatives to Random Sampling

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When is it possible to conduct random sampling, and when is it not? Give an example of a research question that might make random sampling really difficult? What is typically done in the field, given that random sampling is not always feasible (or sometimes, ethical)?

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The solution gives discussion on the use of random sampling, its limitation and its alternative. 270 words.

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When is it possible to conduct random sampling, and when is it not?

Answer: due to limited money and time, we often need to conduct a research by randomly picking up the sample from the whole population. When it is impossible to do the research on all the data, we have to use random sampling to collect data as a sample to be representative of the population.

However, ...

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