Answer
Wrong interpretation.
The margin of error (3 percentage points) was ignored.
Work Step by Step
It should have been said that the confidence interval is between $13−3=10$% and $13+3=16$%
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 9 - Section 9.1 - Assess Your Understanding - Applying the Concepts - Page 436: 22d
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