•
If we fix
n
and the significance level
↵
, then we can determine the power function
⇡
(
μ
)
, the power as a function
of the alternative value
μ
. An example of this function is shown in Figure 18.1.
Exercise 18.2.
If the alternative is less than, show that
⇡
(
μ
) =
Φ
✓

z
↵

μ

μ
0
σ
0
/
p
n
◆
.
Returning to the example with a model species and its mimic. For the plot of the power function for
μ
0
= 10
,
σ
0
= 3
, and
n
= 16
observations,
279
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