A
=1
A
=0
X
=1
X
=0
Total
X
=1
X
=0
Total
S
=1
Y
=1
300
180
480
250
50
300
Y
=0
20
300
320
200
100
300
S
=0
70
130
200
290
110
400
Total
390
610
1000
740
260
1000
Table 1:
A hypothetical data.
