Answer
Agree.
Work Step by Step
The output of the experiment is unbiased; the reason being is that the families were not aware about the experiment, therefore the result can be proved.
Introductory Statistics 9th Edition
by Mann, Prem S.
Published by
Wiley
ISBN 10:
1-11905-571-7
ISBN 13:
978-1-11905-571-6
Chapter 1 - Section 1.6 - Design of Experiments - Exercises - Page 22: 1.36
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