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9-14 Inference aplet
Results The results are:
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
Result Description
Test T T–Test statistic.
Prob Probability associated with the
T–Test statistic.
Critical T Boundary value of T associated
with the α level that you supplied.
Critical
Boundary value 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
≠