The Basic Practice of Statistics 7th Edition

by Moore, David S.; Notz, William I.; Fligner, Michael A.

Published by W. H. Freeman

ISBN 10: 146414253X

ISBN 13: 978-1-46414-253-6

Chapter 17 - Tests of Significance: The Basics - Apply Your Knowledge - Page 400: 17.11a

Answer

.1357 Not statistically significant

Work Step by Step

The z value is the sample mean is decreased by mean and divided by the deviation. z = $\frac{x-u}{o/\sqrt n}$ = $\frac{48.9-50}{15/\sqrt 225}$ = -1.1 Using a z table: .1357

Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.