Answer
Data is collected by telephone. There is very less chance of bias as random-digit telephone dialing procedure is used.
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Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 1 - Statistics, Data, and Statistical Thinking - Exercises 1.1-1.33 - Applying the Concepts - Intermediate - Page 20: 1.26b
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