Answer
2007
Work Step by Step
$σ_{1980}=5.44~years$ and $σ_{2007}=6.36~years$
So, $σ_{2007}\gt σ_{1980}$
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 3 - Section 3.3 - Assess Your Understanding - Applying the Concepts - Page 164: 14d
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