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16.01.2021 •
Mathematics
Which of these statements best defines a stratified random sample?
It is a sample where every nth element of the population is selected in a sequence.
It is a sample where the population is first broken into groups and then elements are randomly selected, in proportion, from each group.
It is a sample where the population is divided into roughly equal groups, and then elements are randomly selected from each group.
It is a sample in which every element has the same chance of being selected from the total population.
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