A systematic error. This may arise because the measuring instrument is not properly calibrated or because there is a bias in recording the results.
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Sampling error can be reduced by
Sampling and Non sampling errors
Pros and Cons of a non-probability sampling
There can be no set value. An acceptable level of sampling error for a company making high precision machine parts is likely to be very different from the sampling error for household incomes, for example.
the difference is just that non-probability sampling does not involve random selection, but probability sampling does.