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kk
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k Z Interval
uu
uu
u 1-Sample Z Interval
1-Sample Z Interval calculates the confidence interval for an unknown population mean
when the population standard deviation is known.
The following is the confidence interval.
Left = o Z
α
2
σ
n
Right = o + Z
α
2
σ
n
However,
α
is the level of significance. The value 100 (1 –
α
) % is the confidence level.
When the confidence level is 95%, for example, inputting 0.95 produces 1 – 0.95 = 0.05 =
α
.
Perform the following key operations from the statistical data list.
4(INTR)
1(Z)
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)
σ
.................................. population standard deviation (
σ
> 0)
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.
o .................................. mean of sample
n .................................. size of sample (positive integer)
6-6-3
Confidence Interval
337


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