HP 49g Graphing Calculator - Manual (Page 178)

Results
TestZ 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.
Critical
X
Bormdary value of .i required by the a value that you
supplied.
Two-Sample Z-Test
Menu name: Z-Test: [xl-ji2
On the basis of two samples, each from a separate population, measures
the strength of the evidence for a selected hypothesis against the null
hypothesis. The null hypothesis is that the mean of population 1 equals the
mean of population 2: H
q \ pj = P 2
You select one of the following alternative hypotheses against which to
test the null hypothesis:
W,:p,
W2--P, > P 2
P 2
Inputs
X
1 Sample 1 mean.
x2 Sample 2 mean.
al Population 1 standard deviation.
a2 Population 2 standard deviation.
nl Sample 1 size.
n2 Sample 2 size.
a Significance level.
Results
Test Z Z-test statistic.
Prob Probability associated with the Z-test statistic.
Critical Z Boundary value of Z associated with the a level that you
supplied.
Page 9-10 Using statistics