Answer
$t_{0.1} = 1.318$
Work Step by Step
α = 0.1, df = 25-1 = 24
Since the mean is $\gt 400$, the test will be right-tailed.
Using Table-VI for a right-tailed test, we have:
$t_{0.1} = 1.318$
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 10 - Section 10.3 - Assess Your Understanding - Skill Building - Page 502: 4b
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