Answer
Because both samples have the same size.
Work Step by Step
The size of both samples is 40. If their sample sizes were different we should use relative frequencies.
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 2 - Section 2.3 - Assess Your Understanding - Applying the Concepts - Page 109: 22a
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