Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 1 - Section 1.6 - Assess Your Understanding - Applying the Concepts: 8b

Answer

It means that neither the experimental unit nor the researcher in contact with the experimental unit knows which treatment the experimental unit is receiving.

Work Step by Step

A person under alcohol dependence may ask for a treatment. If he/she discovers that they received a false medication, this person may become disappointed and change his/her behavior and, maybe, drink more. Thus, double-blind experiments are useful because they make it harder for the patient to figure out if it is a real treatment or not.
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