Casio CFX-9970G, User Manual

Page: 317 / 474

297
u u u u u
1-Prop Z Interval
1-Prop
Z
Interval uses the number of data to calculate the confidence interval
when the proportion is not known. The 1-Prop
Z
Interval is applied to standard
normal distribution.
The following is the confidence interval.
Left = – Z
)
2
Right = + Z
x
n
n
1
n
x
n
x
1 –
x
n
)
2
n
1
n
x
n
x
1
–
n
: sample size
x
: data
Perform the following key operation from the statistical data list.
4 (INTR)
1 (Z)
3 (1-P)
Data is specified using parameter specification. The following shows the meaning
of each item.
C-Level ........... confidence level (0
<
C-Level < 1)
x
..................... data (0 or positive integer)
n
..................... sample size (positive integer)
Execute .......... executes a calculation
Example To calculate the 1-Prop
Z
Interval using parameter value
specification
For this example, we will obtain the 1-Prop
Z
Interval when
C-Level = 0.99,
x
= 55, and
n
= 100.
a.jj w
ff w
baa w
1 (CALC)
Left ................. interval lower limit (left edge)
Right ............... interval upper limit (right edge)
ˆp
..................... expected p-value
n
..................... sample size
Confidence Interval
18 - 7