Distinguish between sampling and non-sampling method.

Sampling

Non-sampling

1. We take a part (sample) of the information.

1. We take every items of the information for studies.

2. Inferences are dra\frn from the sample of universe.

2. Inferences are drawn from the data of complete universe.

3. This is the recent method.

3. This is an old method.

4. Less difficulties are faced because fewer units of the large universe are observed.

4. Many difficulties are generally faced when the universe is large.

5. A small number of trained investigators can collect the complete data.

5. A large army of inyestigators may have to be appointed to collect the data.

6. It is more scientific.

6. It is not so scientific.

7. Possible and reliable in such cases.

7. Only census method can be used in certain case such as, for counting the population of a country.

8. Sampling studies are based not on certainties, but on probabilities.

8. Universe studies are based on certainties.

9. In the case of doubt enquiries can be undertaken for verification. Follow up is easy.

9. In case of doubt it is difficult to undertake- the enquiry again for verification. Follow up is difficult.

10. If first samples are not drawn properly, results may be inaccurate, false and misleading.

10. As all the units are covered in the enquiry, highest accuracy can be debited.