Answer
In an observational study, the researcher has no control over variables. On the other hand, in an experiment, variables can be changed by applying treatments to the groups
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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 24: 1
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