Casio CFX9850GBPLUS - Page 338

20070201
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
R
ight = o + Z
α
2
σ
n
Left = o – Z
α
2
σ
n
R
ight = o + Z
α
2
σ
n
6-6-3
Confi dence Interval