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9-14 Inference aplet
Two-Sample T-Test
Menu name T-Test: µ1 – µ2
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 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:
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.
S1 Sample 1 standard deviation.
S2 Sample 2 standard deviation.
n1 Sample 1 size.
n2 Sample 2 size.
α Significance level.
_Pooled? Check this option to pool samples
based on their standard deviations.
x1
x2