Answer
Rejection region = t < -2.353
Work Step by Step
df = n-1 = 4-1 = 3
$t_{α} = t_{0.05} = 2.353$
Hence Rejection region = t < -2.353
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 8.57 - 8.76 - Learning the Mechanics - Page 377: 8.61f
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