Question: 1) We have a population and we sample randomly from it. This is an example of what kind of sampling? 2) We have a population

1) We have a population and we sample randomly from it. This is an example of what kind of sampling?

2) We have a population with several subpopulations.We randomly sample subjects from each of these subpopulations separately and then combine the results into our final sample. What kind of sampling is this?

3) We have a population with several subpopulations.We sample randomly at the level of these subpopulations, then take all the subjects in the subpopulations that were chosen to form our final sample. What kind of sampling is this?

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