If Delta 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 _____.

If Delta 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.PSU
b.census
c.systematic samples
d.secondary sampling units


Answer: D: Secondary sampling units


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