Answer
There is evidence that says that the mean for untrained tasters is 25 ug/L +
Work Step by Step
Mean = $\frac{30+30+42+...+29+19+23}{10}$ = 29.4
z = $\frac{x-u}{o/\sqrt n}$ = $\frac{29.4- 25}{7/\sqrt 10}$ = 1.99
P = P(Z < -1.99) = 0.0233
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 413: 17.42
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