Casio CFX-9850G PLUS, User'S Manual & Technical Reference

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298
u u
u u
u
1-Prop Z Interval
1-Prop
Z
Interval uses the number of data to calculate the confidence interval for
an unknown proportion of successes.
The following is the confidence interval. The value 100 (1 –
α
) % is the confidence
level.
Left = – Z
α
2
Right = + Z
x
n n
1
n
x
n
x
1
–
x
n
α
2
n
1
n
x
n
x
1
–
n
: sample size
x
: data
Perform the following key operations 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
..................... estimated sample proportion
n
..................... sample size
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Confidence Interval