In order to obtain a sample of undergraduate students in the united states, a simple random sample of 10 states is selected. from each of the selected states, 10 colleges or universities are chosen at random. finally, from each of these 100 colleges or universities, a simple random sample of 20 undergraduate students is selected. thus, the final sample consists of 2,000 undergraduates. this is an example of which type of sampling strategy?

Multistage Sampling.

Explanation:

Multistage Sampling -

It is the method of sampling , where samples are taken in small portion , at every level of the sampling process , is referred to as multistage sampling.  

It is quite a complex method , which require dividing the population into groups , and then further sampling is done, hence it is a long process and require a lot of time.  

Hence, from the question, the type of sampling method involved in the question is multistage sampling.

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