Statistics: Informed Decisions Using Data (4th Edition)

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

Chapter 1 - Section 1.4 - Assess Your Understanding - Applying the Concepts - Page 38: 37b

Answer

The individuals of the sample are randomly selected from the population. So, you may obtain a sample that does not represent the population.

Work Step by Step

Suppose that, in the population (American adults), 40% are Republicans, 40% are Democrats and 20% are Independents. If you decide to obtain a simple random sample of size 100, you may get 30 Republicans, 60 Democrats and 10 Independents. This is not a representative sample of the population.
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