HP 49g Graphing Calculator - Manual (Page 180)

Menu name: Z-Test: P1-P2
On the basis of statistics fi'om two samples, each from a different
population, measures the strength of the evidence for a selected
hypothesis against the null hypotlresis. The null hypothesis is that the
proportion of successes in population 1 equals the proportion of
successes in population 2: H q . K i = n .2
You select one of the following alternative hypotheses against which to
test the null hypothesis:
H I ■ ^ I ^7^2
H
9.
7T
I
^ ^2
Two-Proportion Z-Test
jt/ 2
• I
^7^2
Inputs
XI
X2
111
n2
a
Results
Sample 1 mean.
Sample 2 mean.
Sample 1 size.
Sample 2 size.
Significance level.
Test P1-P2 Difference between the proportions of successes in the
two samples.
Test Z Z-test statistic.
Prob Probability associated with the Z-test statistic.
Critical Z Boimdary value of Z associated with the a level that you
supplied.
Page 9-12 Using statistics