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294
kk
kk
k Z Confidence Interval
You can use the following menu to select from the different types of Z confidence
interval.
•{1-S}/{2-S}/{1-P}/{2-P} ... {1-Sample}/{2-Sample}/{1-Prop}/{2-Prop}
Z Interval
uu
uu
u1-Sample Z Interval
1-Sample Z Interval calculates the confidence interval when standard deviation is
known. Z Interval is applied to normal distribution.
The following is the confidence interval.
However,
α
is not the confidence level itself.
When the confidence level is 95%, for example, inputting 0.95 produces 1 – 0.95 =
0.05 =
α
.
Perform the following key operation 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 specifica-
tion.
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
Freq................ sample frequency
Execute .......... executes a calculation
The following shows the meaning of parameter data specification items that are
different from list data specification.
o ..................... sample mean
n ..................... sample size (positive integer)
18 - 7 Confidence Interval
Left = o – Z
α
2
σ
n
Right = o + Z
α
2
σ
n
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