B) random digit dialing
C) CATI systems
D) a different format
E) an online phone directory
External secondary data may be grouped into which three sources?
A) published, syndicated services data, and databases
B) published, nonpublished data, and other electronic sources
C) syndicated services data, external data, and complex data
D) fields, records, databases
E) published, fields, CRMs
One of the advantages of systematic sampling is that:
A) it is more representative in the final analysis.
B) the listing of the population may contain hidden periodicities.
C) the listing of the population can have sample frame error.
D) it has “economic efficiency”; it is less time consuming and easier to select.