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
(
m
1:
ƒm
2
)
•
H
a
:
m
1
<
m
2
(
m
1:<
m
2
)
•
H
a
:
m
1
>
m
2
(
m
1:>
m
2
)
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:
