The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 21 - Comparing Two Means - Chapter 21 Exercises - Page 509: 21.30b

Answer

nonresponse bias.

Work Step by Step

Not all of the children will be in the sample, thus it is a nonresponse bias.
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