Answer
$H_{o}: μ = 15 ppm$
$H_{o}: μ < 15ppm$
Work Step by Step
Null hypothesis is the theory or status quo. Alternative hypothesis contradicts theory.
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 8 - Inferences Based on a Single Sample - Exercises 8.1 - 8.19 - Applying the Concepts - Intermediate - Page 361: 8.17a
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