Answer
752
Work Step by Step
$\alpha=1-0.9=0.1.$ Then, by using the table, the critical value: $z_{\alpha/2}=z_{0.05}=1.645.$
$\hat{p}$ is unknown, hence:$n=\frac{z^2_{\frac{\alpha}{2}}\cdot0.25}{E^2}=\frac{1.645^2\cdot0.25}{0.03^2}=752.$
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 7 - Estimates and Sample Sizes - Review - Chapter Quick Quiz - Page 367: 5
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