Random sampling is a method of selecting a sample where each member of the population has the same probability of being included in the sample. An equivalent statement is that each subset of the population, of the given size, has the same probability of being selected as any other subset of that size.
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Random Sampling
It can be but it is not simple random sampling.
Simple!
From what i have learned in my math class a census is the most reliable method but is not always applicable so simple random method is the next best.
They include: Simple random sampling, Systematic sampling, Stratified sampling, Quota sampling, and Cluster sampling.