Answer
See below.
Work Step by Step
The degree of freedom of the numerator is the number of groups minus 1: $dfn=I-1=3-1=2.$
The degree of freedom of the denominator is the total sample size ($N$) minus the number of groups: $dfd=N-I=33-3=30$
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 27 - One-Way Analysis of Variance: Comparing Several Means - Apply Your Knowledge - Page 661: 27.10b
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