HP 39gII

112 Inference app
Two-Sample T-Test
Menu name T-Test: μ
1
– μ
2
The Two-sample T-Test is used when the population
standard deviation is not known. On the basis of statistics
from two samples, each sample from a different
population, this test measures the strength of the evidence
for a selected hypothesis against the null hypothesis. The
null hypothesis is that the two populations means are
equal, Η
0
: μ
1
= μ
2
.
You select one of the following alternative hypotheses
against which to test the null hypothesis
Inputs The inputs are:
Critical T Boundary value(s) of T
associated with the α level that
you supplied.
Critical
Boundary value(s) of
required by the α value that you
supplied.
Result Description
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.
s
1
Sample 1 standard deviation.
s
2
Sample 2 standard deviation.
n
1
Sample 1 size.
n
2
Sample 2 size.
α Significance level.
x
1
x
2