A grocery store wants to know whether e-mails containing recipes have an influence on shopping habits. They are able to track who actually opens the e-mails, as well as the time at which the e-mails are deleted, and are able to track purchasing behavior via their preferred customer program that requires scanning of an identification card to get discounted prices. This allows a(n) ____ measure of
the impact of the advertising e-mails.
a. unobtrusive
b. hypothetical
c. self-report
d. subjective
a
Psychology