Why does non-sampling errors occur

1.	Why does non-sampling errors occur
Answer» These\xa0errors are a consequence which can be traced and may arise at any stage of inquiry, viz planning and execution of the survey and collection, processing and analysis of data.some of the non-sampling errors are:\tErrors in Data Acquisition\xa0It arises from the\xa0recording of incorrect responses.\tNon-response Errors It occurs, if an interviewer is unable to contact a person listed .\tSampling Bias It occurs when the sampling plan is such that some members of the target population could not possibly be included.

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