20050501
2-Sample
t
Interval
Command:
TwoSampleTInt
䡺
Description:
This command obtains the confidence interval for the difference between two
population means when the population standard deviations are unknown.
The confidence interval is obtained using the following expressions.
The confidence level is 100 (1 –
α
)%.
When the two population standard deviations are equal (pooled)
Left
=
(
o
1
–
o
2
)
–
t
α
2
Right
=
(
o
1
–
o
2
)
+
t
α
2
n
1
+
n
2
–2
n
1
1 +
n
2
1
x
p
n
–1
2
σ
n
1
+
n
2
–2
n
1
1 +
n
2
1
x
p
n
–1
2
σ
When the two population standard deviations are not equal (not pooled)
Left
=
(
o
1
–
o
2
)–
t
df
α
2
Right
=
(
o
1
–
o
2
)+
t
df
α
2
+
n
1
x
1
n
–1
2
σ
n
2
x
2
n
–1
2
σ
+
n
1
x
1
n
–1
2
σ
n
2
x
2
n
–1
2
σ
C
=
df
=
1
C
2
n
1
–1
+
(1–
C
)
2
n
2
–1
+
n
1
x
1
n
–1
2
σ
n
1
x
1
n
–1
2
σ
n
2
x
2
n
–1
2
σ
Command Syntax
Syntax 1 (list format)
C-Level value, List(1), List(2), Freq(1) (or 1), Freq(2) (or 1), Pooled condition (On
or Off)
* “Freq” can be omitted. Doing so sets “1” for “Freq”.
* “Pooled” can be omitted. Doing so sets “Off” for “Pooled”.
Syntax 2 (parameter format)
C-Level value,
o
1
value,
x
1
σ
n
-1
value,
n
1
value,
o
2
value,
x
2
σ
n
-1
value,
n
2
value,
Pooled condition (On or Off)
* “Pooled” can be omitted. Doing so sets “Off” for “Pooled”.
7-10-7
Confidence Intervals
Summary of Contents for ClassPad 300 PLUS
Page 11: ...20050501 ClassPad 300 PLUS ClassPad OS Version 2 20 ...
Page 197: ...20050501 2 10 7 Using Verify 4 Input x 2 1 and press E 5 Input x i x i and press E ...
Page 649: ...20050501 u Graph Line Clustered D u Graph Line Stacked F 13 8 2 Graphing ...
Page 650: ...20050501 u Graph Line 100 Stacked G u Graph Column Clustered H 13 8 3 Graphing ...
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