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 a:
A)PSU
B)census
C)systematic sample
D)secondary sampling unit

Question

Quizplus · Accepted Answer

The passengers are considered secondary sampling units because they are selected from within the primary sampling units, which are the flights.

If Northwest Airlines Selects Randomly a Set of 40 Flights