If no list of the population exists, then you could not use:

Name: If no list of the population exists, then you could not use:
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Without a list of the population, none of the sampling methods can be used effectively. Systematic sampling requires a list to select every nth person, simple random sampling requires a list to randomly select individuals, and stratified random sampling requires a list to sort individuals into strata. Without a list, it is impossible to ensure a representative sample.

If No List of the Population Exists, Then You Could