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20070201
u
2-Sample
t
Test
2-Sample
t
Test
compares the population means when the population standard deviations
are unknown. The
2-Sample
t
Test
is applied to
t
-distribution.
The following applies when pooling is in effect.
df
=
n
1
+
n
2
– 2
t
=
o
1
–
o
2
n
1
1 +
n
2
1
x
p
n
–1
2
σ
t
=
o
1
–
o
2
n
1
1 +
n
2
1
x
p
n
–1
2
σ
x
p n
–1
=
σ
n
1
+
n
2
–
2
(
n
1
–1)
x
1
n
–1
2
+(
n
2
–1)
x
2
n
–1
2
σ
σ
x
p n
–1
=
σ
n
1
+
n
2
–
2
(
n
1
–1)
x
1
n
–1
2
+(
n
2
–1)
x
2
n
–1
2
σ
σ
¯
x
1
: mean of sample 1
¯
x
2
: mean of sample 2
x
1
σ
n
-1
: standard deviation of
sample
1
x
2
σ
n
-1
: standard deviation of
sample
2
n
1
: size of sample 1
n
2
: size of sample 2
x
p
σ
n
-1
: pooled sample standard
deviation
df
: degrees of freedom
The following applies when pooling is not in effect.
t
=
o
1
–
o
2
x
1
n
–1
2
σ
n
1
+
x
2
n
–1
2
σ
n
2
t
=
o
1
–
o
2
x
1
n
–1
2
σ
n
1
+
x
2
n
–1
2
σ
n
2
df
=
1
C
2
n
1
–1
+
(1–
C
)
2
n
2
–1
df
=
1
C
2
n
1
–1
+
(1–
C
)
2
n
2
–1
C
=
x
1
n
–1
2
σ
n
1
+
x
2
n
–1
2
σ
n
2
x
1
n
–1
2
σ
n
1
C
=
x
1
n
–1
2
σ
n
1
+
x
2
n
–1
2
σ
n
2
x
1
n
–1
2
σ
n
1
6-5-13
Tests
¯
x
1
: mean of sample 1
¯
x
2
: mean of sample 2
x
1
σ
n
-1
: standard deviation of
sample
1
x
2
σ
n
-1
: standard deviation of
sample
2
n
1
: size of sample 1
n
2
: size of sample 2
df
: degrees of freedom
Perform the following key operations from the statistical data list.
3
(TEST)
2
(t)
2
(2-S)
Содержание CFX-9850GB PLUS
Страница 19: ...20070201 4 Contents Appendix 1 Error Message Table α 1 1 2 Input Ranges α 2 1 ...
Страница 335: ...20070201 u Input Example u Results 6 5 25 Tests ...
Страница 361: ...20070201 Calculation Result Output Example p F distribution probability 6 7 15 Distribution ...
Страница 435: ...20070201 8 8 2 Program Library egcw w ww w ...
Страница 437: ...20070201 8 8 4 Program Library Example 1 Example 2 fw fw baw baw bf ca w w ...
Страница 439: ...20070201 8 8 6 Program Library d wba wb w w ...
Страница 441: ...20070201 8 8 8 Program Library dw fcde fcde w wfcde daw wfcde w ...
Страница 443: ...20070201 8 8 10 Program Library b awaw bwaw aw x d w ...
Страница 591: ...20070201 Appendix 1 Error Message Table 2 Input Ranges α ...
Страница 599: ...CASIO Europe GmbH Bornbarch 10 22848 Norderstedt Germany This mark applies in EU countries only ...