Answer
Stratified sampling, the population was divided and then people were randomly chosen from the groups. Bias may be introduced while selecting students.
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 - Review Exercises - Page 31: 27
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