20050401
Left .............................. confidence interval lower limit (left edge)
Right ............................ confidence interval upper limit (right edge)
ˆp 1 ................................. estimated sample propotion for sample 1
ˆp 2 ................................. estimated sample propotion for sample 2
n1 ................................. size of sample 1
n2 ................................. size of sample 2
kk
kk
k t Interval
uu
uu
u 1-Sample t Interval
1-Sample t Interval calculates the confidence interval for an unknown population mean
when the population standard deviation is unknown.
The following is the confidence interval. α is the level of significance. The value 100 (1 –
α) %
is the confidence level.
Left = o– t
n
–
1
α
2
Right = o+ t
n
–
1
α
2
x
n–1
σ
n
x
n–1
σ
n
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 specification.
Data ............................ data type
C-Level ........................ confidence 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 specification items that are different
from list data specification.
6-6-8
Confidence Interval
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