Answer
There is evidence that grease increases sensitivity on the average
Work Step by Step
Mean = $\frac{.07+.64+...+.28+.29}{16}$ = .1013
z = $\frac{x-u}{o/\sqrt n}$ = $\frac{.1013 - 0}{.22/\sqrt 16}$ = 1.84
P = P(Z < -1.84) = 0.0329
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: 17.43b
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