∙
A similar argument works in the continuous case, but we need to
switch the order of the integration.
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EXAMPLE
: Suppose hourly wage
Y
is related to education
X
as
E
Y

X
5.8
.40
X
If the average education level in the population is 12.5, then we can
find the average hourly wage:
E
Y
E
5.8
.40
X
5.8
.40
E
X
5.8
.40
12.5
10.8,
or $10.80.
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