Answer
"Control" needs to be more clearly defined.
Work Step by Step
It is not clear what is meant by "acid control." It is not clear what the actual benefit would be for someone who uses Brand X.
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
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 - Page 25: 40
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