Given the situation described, identify the type of sampling involved. At a newspaper office, staffers are classified by the department in which they work. Then random samples from each department are taken.
(Points : 5)
random sampling
systematic sampling
convenience sampling
stratified sampling
cluster sampling

I picked random sampling but not sure if it correct.

Question

Given the situation described, identify the type of sampling involved. At a newspaper office, staffers are classified by the department in which they work. Then random samples from each department are taken.
  (Points : 5)
      random sampling
      systematic sampling
      convenience sampling
      stratified sampling
      cluster sampling

I picked random sampling but not sure if it correct.

anonymous · Answer

Well it is not purely random because it uses existing grouping (departments) so I would say it is stratified sampling. Look it up on Wikipedia if you want to confirm.