Answer
$n=2928$
Work Step by Step
The earlier sample is the one from the $1998$ through $1994$ data. Thus the sample size is the number after "participants": $n=2928$
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 23 - Comparing Two Proportions - Chapter 23 Exercises - Exploring the Web - Page 557: 23.36b
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