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11-14 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
hp40g+.book Page 14 Friday, December 9, 2005 1:03 AM