Answer
Cluster sample.
Work Step by Step
The author selects polling stations (the clusters) at random that include subjects of all different types. Then he samples all subjects in that cluster. Therefore it is a cluster sample.
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 1 - Introduction to Statistics - 1-4 Collecting Sample Data - Basic Skills and Concepts - Page 33: 18
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