What does it mean to use complementary evidence? Describe how observational data taken from a users smartphone

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What does it mean to use complementary evidence? Describe how observational data taken from a users’ smartphone browser history could be supplemented with complementary evidence to answer questions about some aspect of consumer behavior.
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Essentials of Marketing Research

ISBN: 978-1305263475

6th edition

Authors: Barry J. Babin, William G. Zikmund

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