Arolwg sampl ar hap dros y ffôn yw’r Arolwg Cenedlaethol yn cynnwys 12,500 o bobl ar draws Cymru. Cynhaliwyd y cyfweliadau rhwng Ebrill 2021 a Mawrth 2022, gan gwmpasu ystod eang o bynciau fel gwasanaethau cyhoeddus, iechyd a materion amgylcheddol.
The National Survey is a random sample telephone survey of 12,500 people across Wales. The interviews were carried out between April 2021 and March 2022 and cover a wide range of topics like public services, health, and environmental issues.