Standard errors are affected by the survey design, and can be used to calculate confidence intervals in order to give a more intuitive idea of the size of sampling error for a particular variable.
Gall cynllun yr arolwg effeithio ar y gwallau safonol; a gellid eu defnyddio i gyfrifo lwfansau ansicrwydd er mwyn rhoi syniad mwy greddfol o faint y gwall samplu ar gyfer newidyn penodol.