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 - Extending the Concepts - Page 25: 44


The text part of the statistical study is shown in the step by step section. We can identify that the daily dose of the compound is the independent variable as this quantity was set and varied by the people performing the experiment. The dependent variable would be the amount of the beneficial species which increased in response to the independent variable.

Work Step by Step

According to a pilot study of 20 people conducted at the University of Minnesota, daily doses of a compound called arabinogalactan over a period of 6 months resulted in a significant increase in the beneficial lactobacillus species of bacteria.
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