Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 9 - Inferences from Two Samples - 9-2 Two Proportions - Beyond the Basics - Page 453: 21



Work Step by Step

Using the table: $z_{\alpha/2}=z_{0.05}=1.645.$ Hence the sample size:$n=\frac{z_{\alpha/2}^2}{2E^2}=\frac{1.645^2}{2(0.02)^2}\approx3383.$
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