Answer
a. z
Work Step by Step
z test can be used to test the difference between two sample means when the population variances are known
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
Published by
McGraw-Hill Education
ISBN 10:
0078136334
ISBN 13:
978-0-07813-633-7
Chapter 9 - Testing the Difference Between Two Means, Two Proportions, and Two Variances - Chapter Quiz - Page 542: 8
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