Answer
$X^2=8.11$
Work Step by Step
$X^2=\frac{(n-1))^2s^2}{\sigma^2}=\frac{(40-1))^22.28^2}{5^2}=8.11$
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: 15
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