Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 12 - Data Analysis and Probability - 12-5 Samples and Surveys - Practice and Problem-Solving Exercises - Page 757: 21


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Perhaps, older people are more likely to volunteer because they are retired and have more time on their hands. It is also possible that older people want to spend more time with their family and thus volunteer less. To obtain a truly random sample, you should call later in the day, when younger people who are working will be at home.
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