Inferential Statistics and Distributions 13-23
8313INFE.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:47 PM Printed: 02/19/01 1:38 PM
Page 23 of 36
2
.
Samp
Ü
Test
(two-sample
Û
-test; item
D
) computes an
Û
-test to compare two normal population standard
deviations (
s
1
and
s
2
). The population means and standard
deviations are all unknown.
2
.
Samp
Ü
Test
, which uses the
ratio of sample variances Sx1
2
/Sx2
2
, tests the null
hypothesis H
0
:
s
1
=
s
2
against one of the alternatives below.
•
H
a
:
s
1
ƒs
2
(
s
1:
ƒs
2
)
•
H
a
:
s
1
<
s
2
(
s
1:<
s
2
)
•
H
a
:
s
1
>
s
2
(
s
1:>
s
2
)
In the example:
SAMP4={
7
L
4 18 17
L
3
L
5
1 10 11
L
2}
SAMP5={
L
1 12
L
1
L
3
3
L
5
5
2
L
11
L
1
L
3}
Data
Stats
Input:
,
,
Calculated results:
,
,
Drawn results:
2-Samp
Ü
Test
