Predicted +
Predicted _
column total
Real+ Real - Row total
a
b
a+b
c
d
c+d
a+c b+d
n
This test uses only the number of discordant pairs, that is, the number of pairs for which
the control was affirmative response but the “predicted” was not (number indicated by
letter “c”) and the number of pairs where the “predicted” was affirmative response but the
control was not (number indicated by letter b). The number indicated by letter “a” and
“d” provide no information about the association between “predicted” and the
“expected”. The following equation was used:
X2 = (|b-c| - 0.5) 2
b+c
chi-square =___, which has one degree of freedom. The two-tailed P value is ____ (if
p<0.05 there is correlation).
The dependent variable is measured by testing the correlation between “predicted” ____
and the “expected” _____.
chi-square=___, which has one degree of freedom. The two-tailed P value is ____ (if
p>0.05 there is no correlation) thus supporting the null hypothesis and refuting the
alternative hypothesis.