Answer
If an expected frequency of a class is less than 5, then that class can be combined with another class so that the expected frequency is 5 or more.
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 11 - Other Chi-Square Tests - 11-1 Test for Goodness of Fit - Exercises 11-1 - Page 619: 4
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