33
k
k
k
k
k
Z
Interval
u
u
u
u
u
1-Sample
Z
Interval
1-Sample
Z
Interval
calculates the confidence interval for an unknown population mean
when standard deviation is known.
The following is the confidence interval.
Left
=
o
–
Z
!
2
"
n
Right
=
o
+
Z
!
2
"
n
However,
!
is not the confidence level itself. The value 100 (1-
!
) % is the confidence level.
When the confidence level is 95%, for example, inputting 0.95 produces 1
–
0.95 = 0.05 =
!
.
Perform the following key operation from the statistical data list.
4
(INTR)
b
(Z)
b
(1-Smpl)
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)
"
.................................. population standard deviation (
"
> 0)
List .............................. list whose contents you want to use as sample data
Freq ............................. sample frequency
Save Res .................... list for storage of calculation results (None or List 1 to 20)
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)
