A researcher is interested in evaluating the earnings of airport staff in the United States (US). Suppose the US has about 5,200 airports. A decision is made to classify all 5,200 airports as distinct groups, where the employees of each airport represent a group. You then perform simple random sampling technique to select 100 airports from your 5,200 groups. The earnings of the employees in those 100 airports will represent the primary data for your study.

A Did you use stratified simple sampling or cluster sampling?

B) What are the benefits other simple random sampling?