Sampling and Non sampling errors
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sampling is a waste of time
Sampling errors are errors in the data collected during the carrying out of quantitative data surveys. They can occur for various reasons, e.g. surveys that were incorrectly filled out. It is generally said that a survey needs to have a margin of error of under 3% to be statistically significant.
census is conducted for group data so if it is a sampling data is taken it would lead to lot of non sampling errors
sources of errors encountered in measurment
non response, in accurate response and selection bias