A sample of businesses were randomly selected by Market Location and businesses within each activity group and region were randomly contacted and interviewed until the quota targets where met.
Dewiswyd sampl o fusnesau ar hap gan Market Location a chysylltwyd â busnesau o fewn pob grŵp gweithgareddau a rhanbarth a chyfwelwyd â nhw ar hap nes i'r targedau cwota gael eu bodloni.