Texas Instruments TI-84 Plus Guide Book

Chapter 13: Inferential Statistics and Distributions 361
2-SampFTest
2-SampFTest2-SampFTest
2-SampFTest
2-SampÜTest (two-sample Ü-test; item E) computes an Ü-test to compare two normal
population standard deviations (s
1
and s
2
). The population means and standard
deviations are all unknown.
2-SampÜTest, 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
ƒ
s
2
(s1:ƒs2)
•H
a
: s
1
<s
2
(s1:<s2)
•H
a
: s
1
>s
2
(s1:>s2)
Calculated
results:
Drawn results:

Texas Instruments TI-84 Plus Specifications

General

Battery type	AAA
Power source	Battery
Number of batteries supported	4
Type	Graphing
Cover	No
Form factor	Pocket
Control type	Buttons
Product color	Black
USB port	Yes
USB 2.0 ports quantity	1
Digits	- digits
Display number of lines	8 lines
Display number of characters	16
RAM capacity	0.024 MB
ROM capacity	0.480 MB
Storage media type	-