Manual

Inference app 249
Results The results are:
Two-Proportion Z-Test
Menu name Z-Test: 
1
– 
2
On the basis of statistics from two samples, each from a
different population, this test measures the strength of the
evidence for a selected hypothesis against the null
hypothesis. The null hypothesis is that the proportions of
successes in the two populations are equal, 
0
: 
1
= 
2
.
You select one of the following alternative hypotheses
against which to test the null hypothesis:
H
0
: 
1
< 
2
H
0
: 
1
> 
2
H
0
: 
1
≠ 
2
Inputs The inputs are:
Result Description
Test Z Z-Test statistic
Test Proportion of successes in the sample
P Probability associated with the Z-Test
statistic
Critical Z Boundary value(s) of Z associated
with the level that you supplied
Critical Proportion of successes associated
with the level you supplied
p
ˆ
p
ˆ
Field name Definition
x
1
Sample 1 success count
x
2
Sample 2 success count
n
1
Sample 1 size
n
2
Sample 2 size
 Significance level