Non-sampling Errors
Non-sampling errors are more serious than sampling errors because a sampling error can be minimised by taking a larger sample.It is difficult to minimise non-sampling error,even by taking a large sample.
Some of the non-sampling errors are the following.
1.Errors in data acquisition.
This type of error arises from recording of incorrect responses.
2.Non-response errors.
Non-response errors occurs if an interviewer is unable to contact a person listed in the sample or a person from the sample refuses to respond.
3.Sampling Bias.
Sampling bias occurs when the sampling plan is such that some members of the target population could not possibly be included in the sample.
