Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 1 - Section 1.2 - Assess Your Understanding - Vocabulary and Skill Building - Page 20: 6


See explanation.

Work Step by Step

It's a cohort study because the group was observed for 10 years and exposed to non intentional factors. It's more trustworthy because the researchers do not need to ask the group about their past behavior.
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