HP 39g+ - Manual (Page 124)

9-10 Inference aplet
Results The results are:
Two–Sample Z–Test
Menu name Z–Test:
µ
1–
µ
2
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
0
:
µ
1
=
µ
2
).
You select one of the following alternative hypotheses against
which to test the null hypothesis:
Inputs The inputs are:
Result Description
Test Z Z–test statistic.
Prob Probability associated with the
Z–Test statistic.
Critical Z Boundary values of Z associated
with the
α
level that you supplied.
Critical
Boundary values of required by
the
α
value that you supplied.
x x
H
1
µ
1
µ
2
<
H
1
µ
1
µ
2
>
H
1
µ
1
µ
2
≠
Field name Definition
Sample 1 mean.
Sample 2 mean.
n1 Sample 1 size.
n2 Sample 2 size.
σ
1 Population 1 standard deviation.
σ
2 Population 2 standard deviation.
α
Significance level.
x1
x2