Answer
Cluster sample.
Work Step by Step
The author selects 20 different clusters at random that have all the different kind of subjects Then, he samples every single subject in the 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: 16
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