The Wales Omnibus Survey involves interviews with a quota sample of a minimum of 1,000 adults aged 16 years and over who are resident in Wales.
Mae Arolwg Omnibws Cymru yn cynnwys cyfweliadau â sampl cwota o 1,000 o oedolion 16 oed a throsodd sy'n byw yng Nghymru, o leiaf.