Discussion
When the universe is heterogenous and too large, the best sampling method which can be adopted is
Answer: B
When the universe is heterogeneous and too large, the key gives stratified sampling as the best method. The population is divided into strata of similar units and a sample is drawn from each, so every part of a heterogeneous universe is represented.
Simple random sampling gives no safeguard for heterogeneity and is hard to carry out on a very large universe. Multi-stage sampling suits a very large universe, but it is the stratified method that the key accepts, so the second option is correct.
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