healthy
population
mean
0
standard
deviation
1
diseased
population
mean
2
standard
deviation
1
uncertainty
of
measurement
first
test
0
.
2
second
test
0
.
6
0
.
2
0
.
4
0
.
6
0
.
8
1
.
0
1

specificity
0
.
0
0
.
2
0
.
4
0
.
6
0
.
8
1
.
0
sensitivity
ratio
of
the
two
areas
=
1
.
03366