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 - Page 25: 33

Answer

The sample is not sufficient to allow for general conclusions to be valid.

Work Step by Step

The sample is too small. 20 subjects cannot be representative of the entire population. The sample was from one geographic location and possibly from a student-only group, which is not representative of entire population.
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