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.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 1 - Introduction to Statistics - 1-4 Collecting Sample Data - Page 33: 18
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