Probability Sampling V/S Non-Probability Sampling
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Probability Sampling |
Non-Probability Sampling |
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| Meaning | (i) Probability sampling provides an equal chance of being selected in the sample to each element of the population.
(ii) A probability sample is one, where the selected units have some specific chance of being included in the sample.
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(i) Non-Probability sampling does not provide an equal chance of being selected in the sample to each element of the population.
(ii) A non-probability sample is arbitrarily selected. |
| Type of method | It is a systematic and modern method of sampling | It is a traditional and rather outdated method of sampling.
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| Selection of sample | The sample is selected by chance or at random | The sample is selected by choice
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| Selection process | The selection process is controlled objectively so that the items will be chosen strictly at random | The selection process is, at least partially, subjective |
| Benefit | It helps to select a truly representative sample Here, the selection of sample items is independent of the person making the study (researcher) | The sample selected may or may not be a true representative of the whole population as it is selected as per the convenience of the researcher |
| Nature of process | It is a mechanical and mathematical process | It is a mental process/exercise of the researcher |
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