Answer
2007.
Work Step by Step
$μ_{1980}=25.49~years$ and $μ_{2007}=27.86~years$
So, $μ_{2007}\gt μ_{1980}$
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: 14c
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