Answer
Clustered sampling technique is used as the area is divided into groups and then some of the groups were selected as a whole. Bias can be introduced by responders and preferences of interviewers.
Work Step by Step
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Elementary Statistics: Picturing the World (6th Edition)
by Larson, Ron; Farber, Betsy
Published by
Pearson
ISBN 10:
0321911210
ISBN 13:
978-0-32191-121-6
Chapter 1 - Introduction to Statistics - Section 1.3 Data Collection and Experimental Design - Exercises - Page 25: 26
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