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: 27.10a

Answer

$33$

Work Step by Step

$N$ is the total sample size, thus it is the sum of the individual sample sizes: $N=n_1+n_2+n_3=12+9+12=33$

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