Which sampling should be used when each group considered has small variation within itself but there is wide variation between different groups?

Which sampling should be used when each group considered has small var

1.	Which sampling should be used when each group considered has small variation within itself but there is wide variation between different groups?
Answer» Stratified random sampling should be used when each group considered has small variation within itself but there is wide variation between different group.

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Which sampling should be used when each group considered has small variation within itself but there is wide variation between different groups?

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