Answer
The sample must be random in order to perform the sign test.
Work Step by Step
According to the problem text, only those who agreed to participate responded to the survey. So, the sample is not random.
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 15 - Section 15.3 - Assess Your Understanding - Applying the Concepts - Page 752: 19
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