Answer
t=-2.36
Work Step by Step
$t=\frac{\bar{x}-\mu}{\frac{s}{\sqrt n}}=\frac{7.15-8}{\frac{2.28}{\sqrt {40}}}=-2.36$
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 8 - Hypothesis Testing - 8-2 Basics of Hypothesis Testing - Page 391: 16
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