Elementary Statistics (12th Edition)

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: 14

Answer

Stratified sample.

Work Step by Step

The people doing acupuncture were put into different groups based on the different types of acupuncture. After, the subjects in each group were compared to each other to see the effects of each type of acupuncture on their back pain. Therefore it is a stratified sample.
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