The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 9 - Producing Data: Experiments - Chapter 9 Exercises - Page 247: 9.29c

Answer

Another lurking variable is the amount of unhealthy foods consumed as well. They affect one's personal health too.
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