If Virgin Australia randomly selects a set of 10 flights on a given day, then randomly selects a groups of 10 passengers on each of these flights to participate in an in-flight survey, then the passengers are a:
A) primary sampling unit.
B) tertiary sampling unit.
C) systematic sampling unit.
D) secondary sampling unit.

Question

Quizplus · Accepted Answer

The flights are the primary sampling unit as they are being randomly selected as the basis for the sample. Within each flight, the passengers are the secondary sampling unit. Therefore, the passengers are not the primary sampling unit and are not being systematically selected, making choices A and C incorrect. Tertiary sampling units are further subdivisions within secondary sampling units, so it is not applicable in this scenario. Therefore, the best choice is D.

If Virgin Australia Randomly Selects a Set of 10 Flights