Chapter 13: Inferential Statistics and Distributions 226
2-SampTTest
2-SampTTest (two-sample t test; item 4) tests the equality of the means of two populations (m
1
and
m
2
) based on independent samples when neither population standard deviation (s
1
or s
2
) is
known. The null hypothesis H
0
: m
1
=m
2
is tested against one of the alternatives below.
•H
a
: m
1
ƒm
2
(m1:ƒm2)
•H
a
: m
1
<m
2
(m1:<m2)
•H
a
: m
1
>m
2
(m1:>m2)
In the example:
SAMP1={12.207, 16.869, 25.05, 22.429, 8.456, 10.589}
SAMP2={11.074, 9.686, 12.064, 9.351, 8.182, 6.642}
Data Stats
Input:
Calculated
results:
Drawn
results:
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