Answer
(a).
Work Step by Step
If we do the explained method, then we will get $3$ confidence intervals, but we do not know how "confident" the results are when we combine the result of the three confidence intervals. Thus the answer is (a).
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 - Check Your Skills - Page 668: 27.21
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