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 - Applying the Concepts - Page 21: 20a


This is an observational study because the individuals were free to get married or stay single (explanatory variable). This is a cohort study.

Work Step by Step

Read the observational study definition, page 16. This is a cohort study (page 18): - 8000 men and women were followed (the cohort). - They were followed for a long period of time (7 years). - They were free of the influence of the researchers during this period. - After this period, the weight gain was recorded (response variable).
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