An accountant has to check a sample of invoices. The invoices are divided into three groups, by value as follows:"under £100、'£100 - £500' and 'over £500'. Samples are then selected randomly from each group.Which ONE of the following sampling methods is involved?
A、Cluster
B、Multi-stage
C、Quota
D、Stratified
A、Cluster
B、Multi-stage
C、Quota
D、Stratified
【参考答案及解析】
Accountant first stratifies the invoices according to value and then selects randomly. Sampling method is stratified.
Accountant first stratifies the invoices according to value and then selects randomly. Sampling method is stratified.