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Inference aplet 11-11
Inputs The inputs are:
Results The results are:
Two-Proportion Z-Test
Menu name Z-Test: π1 – π2
On the basis of statistics from two samples, each from a
different population, the Two-Proportion Z-Test measures
the strength of the evidence for a selected hypothesis
against the null hypothesis. The null hypothesis is that the
proportion of successes in the two populations is equal
H0: π
1
= π
2
.
You select one of the following alternative hypotheses
against which to test the null hypothesis:
Field name Definition
x Number of successes in the sample.
n Sample size.
π
0
Population proportion of successes.
α Significance level.
Result Description
Test P Proportion of successes in the sample.
Test Z Z-Test statistic.
Prob Probability associated with the Z-Test
statistic.
Critical Z Boundary value of Z associated with
the level you supplied.
H
1
:π
1
π
2
<
H
1
:π
1
π
2
>
H
1
:π
1
π
2
≠
hp40g+.book Page 11 Friday, December 9, 2005 1:03 AM