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 - Page 397: 14



Work Step by Step

$z=\frac{\hat{p}-p}{\sqrt{\frac{p(1-p)}{\sqrt n}}}=\frac{0.48-0.5}{\sqrt{\frac{0.5(1-0.5)}{\sqrt {1002}}}}=-1.27.$
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