Casio CFX-9850GB PLUS, Руководство пользователя

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k Z
Interval
u
1-Sample Z Interval
1-Sample
Z
Interval calculates the confi dence interval for an unknown population mean
when the population standard deviation is known.
The following is the confi dence interval.
However,
α
is the level of signifi cance. The value 100 (1 –
α
) % is the confi dence level.
When the confi dence 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 specifi cation.
Data ............................. data type
C-Level ......................... confi dence 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 specifi cation items that are different
from list data specifi cation.
¯ x
.................................. mean of sample
n
.................................. size of sample (positive integer)
Left =
o
– Z
α
2
σ
n
Right =
o
+ Z
α
2
σ
n
Left =
o
– Z
α
2
σ
n
Right =
o
+ Z
α
2
σ
n
6-6-3
Confi dence Interval