Elementary Statistics (12th Edition)

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

Chapter 8 - Hypothesis Testing - 8-2 Basics of Hypothesis Testing - Basic Skills and Concepts: 13

Answer

z=10.33.

Work Step by Step

$z=\frac{\hat{p}-p}{\sqrt{\frac{p(1-p)}{\sqrt n}}}=\frac{0.89-0.75}{\sqrt{\frac{0.75(1-0.75)}{\sqrt {1021}}}}=10.33.$
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