Mathematics, 12.08.2019 19:20 love0000
In order to obtain a sample of undergraduate students in the world, a simple random sample of 10 countries is selected. from each of the selected countries, 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:
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