We need sampling in many situations such as
- When population is infinite (very very large enough)
- When the item or units destroyed under investigation
- When the results are required in a short time
- When resources for survey are limited particularly in respect of time, cost and trained persons.
- When area under study is wide enough
For detailed discussion of reasons to sample follow the link http://itfeature.com/statistics/sampling-theory-introduction-and-reasons-to-sample
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