Answer
Statistically significant
Work Step by Step
z = $\frac{x-u}{o/\sqrt n}$ = $\frac{126.07 - 129}{15/\sqrt 72}$ = -1.66
P = 2P(Z < -1.66) = 2(.0485) = .097
Thus, the difference is statistically significant.
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 17 - Tests of Significance: The Basics - Chapter 17 Exercises - Page 414: 17.44c
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