As with any sample survey, results from Farm Business Survey will have a degree of sampling error because only part of the population is being used to estimate the value of a variable.
Fel gydag unrhyw arolwg sampl, bydd gan ganlyniadau o'r Arolwg o Fusnesau Ffermio rywfaint o wall samplu gan mai dim ond rhan o'r boblogaeth sy'n cael ei defnyddio i amcangyfrif gwerth newidyn.