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: 21

Answer

P=0.2186, z=±1.96.

Work Step by Step

The P is the probability of the z-score being more than 1.23 or less than -1.23 is the sum of the probability of the z-score being less than -1.23 plus 1 minus the probability of the z-score being less than 1.23, hence:P=0.1093+1-0.8907=0.2186. The critical value is the z-score belonging to 0.025 to the left or right, hence z=±1.96.
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