Elementary Statistics (12th Edition)

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

Chapter 7 - Estimates and Sample Sizes - 7-2 Estimating a Population Proportion - Basic Skills and Concepts - Page 337: 10


$0.25\pm 0.085.$

Work Step by Step

$\hat{p}$ is the sample average of the boundaries, hence:$\hat{p}=\frac{0.165+0.335}{2}=0.25.$ E is half of the confidence interval, hence:$E=\frac{0.335-0.165}{2}=0.085$, hence the confidence interval:$0.25\pm 0.085.$
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