HP 39G

9-12 Inference aplet
Results The results are:
Two–Proportion Z–Test
Menu name Z–Test: P1–P2
On the basis of statistics from two samples, each from a
different population, the 2 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.
(H
0
: π
1
= π
2
).
You select one of the following alternative hypotheses against
which to test the null hypothesis:
Inputs The inputs are:
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
≠
Field name Definition
;1 Sample 1 mean.
X2 Sample 2 mean.
n1 Sample 1 size.
n2 Sample 2 size.
α Significance level.