Answer
(c).
Work Step by Step
For a $99\%$ confidence interval $z^*=2.576$ and also here $n=8,\sigma=0.001$.
Hence the margin of error: $z^*\frac{\sigma}{\sqrt n}=2.576\frac{0.001}{\sqrt8}\approx0.00091$, thus the answer is (c).
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 16 - Confidence Intervals: The Basics - Check Your Skills - Page 387: 16.14
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