Answer
z is the critical value
Work Step by Step
The critical value "represents the number of standard deviations the same statistic can be from the parameter and still result in an interval that includes the parameter" (pg. 430).
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 9 - Section 9.1 - Assess Your Understanding - Vocabulary and Skill Building - Page 436: 4
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