Discussion
How stratified sampling is carried out ?
Answer: B
Stratified sampling is carried out by dividing the population into homogeneous groups and selecting equally but randomly.
The population is first divided into strata whose members are alike in the characteristic that matters (for example soil type, land-use class or income group), and a random sample is then drawn from each stratum. This ensures every group is represented.
Option A and D describe simple random sampling, and C is wrong because the groups in stratified sampling are not formed at random but by a known characteristic.
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