20070201
Left ...............................confi dence interval lower limit (left edge)
Right .............................confi dence interval upper limit (right edge)
ˆp1 .................................estimated sample propotion for sample 1
ˆp2 .................................estimated sample propotion for sample 2
n1 ................................. size of sample 1
n2 ................................. size of sample 2
k t Interval
u 1-Sample t Interval
1-Sample t Interval calculates the confi dence interval for an unknown population mean
when the population standard deviation is unknown.
The following is the confi dence interval.
α is the level of signifi cance. The value 100 (1 – α)
% is the confi dence level.
Perform the following key operations from the statistical data list.
4(INTR)
2(t)
1(1-S)
The following shows the meaning of each item in the case of list data specifi cation.
Data ............................. data type
C-Level ........................confi dence level (0 < C-Level < 1)
List ............................... list whose contents you want to use as sample data
(List 1 to 26)
Freq .............................sample frequency (1 or List 1 to 26)
Save Res .....................list for storage of calculation results (None or List 1 to 26)
Execute ....................... executes a calculation
The following shows the meaning of parameter data specifi cation items that are different
from list data specifi cation.
Left = o– t
n – 1
α
2
Right = o+t
n – 1
α
2
x
n–1
σ
n
x
n–1
σ
n
Left = o– t
n – 1
α
2
Right = o+t
n – 1
α
2
x
n–1
σ
n
x
n–1
σ
n
6-6-8
Confi dence Interval
