Texas Instruments TI-82 STATS - Page 261

Inferential Statistics and Distributions 13–23
8250FC~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:39 PM Printed: 10/27/05 2:57
PM Page 23 of 36
2.SampÜ
ÜÜ
ÜTest (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.SampÜ
ÜÜ
ÜTest, 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
(s1:ƒs2)
• H
a
: s
1
<s
2
(s1:<s2)
• H
a
: s
1
>s
2
(s1:>s2)
In the example:
SAMP4={ 7 L41817 L3 L5 1 10 11 L2}
SAMP5={ L112 L1 L33L552L11 L1 L3}
Data Stats
Input:
,,
Calculated results:
,,
Drawn results:
2.SampÜ
ÜÜ
ÜTest