If Northwest Airlines selects randomly a set of 40 flights on a given day,and then selects randomly a group of ten passengers on each of these flights to participate in an in-flight survey,the passengers are best referred to as a ____.
A)PSU
B)census
C)systematic sample
D)secondary sampling unit

Question

Quizplus · Accepted Answer

The passengers selected from each flight are not the primary sampling unit (PSU) because the PSU is the flight itself. Also, since all passengers on the flights are not being surveyed, this is not a census. The sampling method is not systematic, as it involves random selection. Therefore, the best term to describe the passengers is secondary sampling unit (SSU), as they are the units randomly selected within the PSU (flight).

If Northwest Airlines Selects Randomly a Set of 40 Flights