Answer
1.28
Work Step by Step
$σ_{x̅1-x̅2} = \sqrt{ (100/100 + 64/100})$
= $\sqrt {(1+64/100)} = 1.28$
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 9 - Inferences Based on Two Samples - Exercises 9.1 - 9.29 - Learning the Mechanics - Page 423: 9.10a
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