Answer
$17$
Work Step by Step
$df=min(n_1-1,n_2-1)=min(18-1,18-1)=17$
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 21 - Comparing Two Means - Chapter 21 Exercises - Page 510: 21.32a
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