Answer
People tend not to report their true income. Moreover, size of the sample may not be large enough and sample may not cover graduates of all social backgrounds.
Work Step by Step
No steps
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
Published by
McGraw-Hill Education
ISBN 10:
0078136334
ISBN 13:
978-0-07813-633-7
Chapter 1 - The Nature of Probability and Statistics - Review Exercises - Section 1-4 - Page 35: 55
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