Texas Instruments TI-83 - Page 261

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
41817
L
3
L
5 1 10 11
L
2}
SAMP5={
L
112
L
1
L
33
L
552
L
11
L
1
L
3}
Data Stats
Input:
,,
Calculated results:
,,
Drawn results:
2-Samp
Ü
Test