Answer
Observational study
Work Step by Step
This is an observational study because Emily Rosa did not give any treatments to the therapists. She simply observed which if they correctly identified the hand she chose.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 1 - Introduction to Statistics - 1-4 Collecting Sample Data - Page 32: 7
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