Provide the marketing researcher's definitions for each of the following populations:
a. Columbia House, a mail-order house specializing in movie and television DVDs and music CDs, wants to determine interest in a 12-for-1 offer on its CDs to new members.
b. The manager of your student union is interested in determining if students desire a "universal" debit ID card that will be accepted anywhere on campus and in many stores off campus.
c. Joy Manufacturing Company decides to conduct a survey to determine the sales potential of a new type of air compressor used by construction companies.