Population vs Sample

Population vs Sample

Population is defined as entire group of items, people or any group while sample is a smaller set of items, people that is collected from larger group and sample is derived from population

The need of sampling comes in place as it is impossible to calculate all the features of population every time, therefore study is done on sample and inference on population is drawn.

For ex.- Exit pools- In this a survey is done on limited people as soon as they cast their vote and basis on results of same predictions on results are made. Some pools are also done before the voters cast their vote.

Sampling techniques

1) Simple random sampling

2) Systematic sampling

3) Stratified sampling

4) Clustered sampling

Non-probability sampling methods

1) Convenience sampling

2) Quota sampling

3) Judgement or purposive sampling

4) Snowball sampling