HP 39g Graphing Calculator - Manual (Page 126)

Results The results are:
Result Description
TestZ Z-test statistic.
Prob Probability associated with the
Z-Test statistic.
Critical Z Boundary values of Z associated
with the a level that you supplied.
Critical X
Boundary values of T required by
the a value that you supplied.
Two-Sample Z-Test
Menu name Z-Test: |al-|a2
On the basis of two samples, each from a separate population,
this test measures the strength of the evidence for a selected
hypothesis against the null hypothesis. The null hypothesis is
that the mean of the two populations are equal ( H
q : |I j = ^
2
)-
You select one of the following alternative hypotheses against
which to test the null hypothesis:
/ / , : P i < P
2
> P
2
//] :|ij fl
2
Inputs The inputs are:
Field name Definition
I'l
Sample 1 mean.
x
2
Sample 2 mean.
nl Sample 1 size.
n
2
Sample 2 size.
a! Population 1 standard deviation.
g 2
Population 2 standard deviation.
a Significance level.
9-10 Inference aplet