User's Manual
Inferential Statistics and Distributions 13-13
8313INFE.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:47 PM Printed: 02/19/01 1:38 PM
Page 13 of 36
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:
2
.
SampTTest