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F
2-Sample
Te t
F
2-Sample
Te t
Menu:
[Test]-[Two-Sample FTest]
De cription: This command tests hypotheses concerning the ratio of the population
variance of two populations. A 2-Sample
s
s
2
2
x
x
1
1
F =
F =
s
s
2
2
x
x
2
2
Definition of Term
σ
condition: population standard deviation test conditions (" " specifies two-
1
List(1) :
List(2) :
Freq(1) :
Freq(2) :
s
:
x
1
n
:
1
s
:
x
2
n
:
2
Calculation Re ult Output
σ
σ
:
1
2
F
:
p
:
:
1
:
2
s
:
x
1
s
:
x
2
n
:
1
n
:
2
Example
list1 : { 7, −4, 18, 17, −3, −5, 1, 10, 11, −2, −3 }
list2 : { −1, 12, −1, −3, −3, 3, −5, 5, 2, −11, −1, −3 }
• Stati tic Wizard Operation
(1) Input the data into [list1] and [list2] in the Stat Editor.
(2) On the menu bar, tap [Calc] and then [Test].
(3) Select [Two-Sample FTest] and [List], and then tap
[Next >>].
(4) Select the σ
condition [ ].
1
(5) Select List(1) [list1], List(2) [list2], Freq(1) [1] and
Freq(2) [1].
(6) Tap [Next >>].
(7) To display the graph, tap
7-9-16
Tests
tail test, "<" specifies one-tail test where sample 1 is smaller than
sample 2, ">" specifies one-tail test where sample 1 is greater than
sample 2.)
list where sample 1 data is located
list where sample 2 data is located
frequency of sample 1 (1 or list name)
frequency of sample 2 (1 or list name)
sample standard deviation of sample 1 (s
size of sample 1 (positive integer)
sample standard deviation of sample 2 (s
size of sample 2 (positive integer)
test condition
F
value
p
-value
sample mean of sample 1 data (Displayed only for list format.)
sample mean of sample 2 data (Displayed only for list format.)
sample standard deviation of sample 1
sample standard deviation of sample 2
size of sample 1
size of sample 2
.
20090601
F
F
Test uses
distribution.
> 0)
x
1
> 0)
x
2
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