Answer
A different person should ask the question.
Work Step by Step
Though the dentist is an expert, many people will be afraid to tell the truth, so based on Example 1.c on page 772, a different person should ask the question.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 11 Data Analysis and Statistics - Extension - Design Surveys and Experiments - Practice - Page 773: 3
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