Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 1 - The Nature of Probability and Statistics - 1-4 Experimental Design - Exercises: 16

Answer

Observational

Work Step by Step

The researcher is not manipulating any of the variables; instead, they are using past records to try to reach a conclusion.
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