Answer
See below.
Work Step by Step
To use the two-proportion z-test we need the two samples to be independent.
Here we cannot use the test because the two samples contain data about the same people and thus are not independent.
Stats: Data and Models (3rd Edition)
by De Vaux, Richard D.; Velleman, Paul D.; Bock, David E.
Published by
Pearson
ISBN 10:
0321692551
ISBN 13:
978-0-32169-255-9
Chapter 22 - Comparing Two Proportions - Exercises - Page 541: 5
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