1. When the information is needed on every unit in the population such as individuals, dwelling units or business establishments, a sample survey cannot be of much help for it fails to provide information on individual count.
2. Sampling gives rise to certain errors. If these errors are too large, the results of the sample survey will be of extremely limited use.
3. While in a census survey it may be easy to check the omissions of certain units in view of complete coverage, this is not so in the case of sample survey.
2. Sampling gives rise to certain errors. If these errors are too large, the results of the sample survey will be of extremely limited use.
3. While in a census survey it may be easy to check the omissions of certain units in view of complete coverage, this is not so in the case of sample survey.