The Proportions Against
a Specified Value test is used for large
samples to test the hypothesis:
H_{0}: the proportion is the
same in both populations
H_{1}: the proportion is [different
to/greater than/less than] the specified
value
The value of the Z statistic
is calculated from:
Where:

proportion in the sample 

specified value of the proportion 
n 
sample size 
The probability corresponding to Z_{0}
can be found from tables.
