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Table 3. Hypothesis Testing for Two Proportions [3]
CHI-SQUARE
DISTRIBUTION
The chi-squared distribution
has only one parameter
,
m
. This parameter is called the number of degrees
of freedom of the distribution
, where
In this distribution
,
the critical region is where
area
under the curve
,
with
m
degrees of freedom
, lies to the
right of the critical value
,
. The chi-square distribution is not symmetric [2]. See Figure 12 below. It is also important to note that this
distribution has a mean of
m
and a variance of
2m
[1].
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same amount
focus will be
actual value
simple case
area 
with m 
. The chi-square distribution is not symmetric [2]. See Figure 12 below. It is also important to note that this