Casio FX-9750G PLUS User's Manual & Technical Reference page 326

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Confidence Interval
u u u u u 1-Prop Z Interval
1-Prop
an unknown proportion of successes.
The following is the confidence interval. The value 100 (1 –
level.
Perform the following key operations from the statistical data list.
Data is specified using parameter specification. The following shows the meaning
of each item.
298
Z
Interval uses the number of data to calculate the confidence interval for
– Z α
x
Left =
n
2
α
x
Right = + Z
n
2
4(INTR)
1(Z)
3(1-P)
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
specification
For this example, we will obtain the 1-Prop
C-Level = 0.99,
a.jjw
ffw
baaw
1(CALC)
Left ................. interval lower limit (left edge)
Right ............... interval upper limit (right edge)
ˆ p
..................... estimated sample proportion
n
..................... sample size
1
x x
1–
n n n
1
x x
1–
n n n
Z
Interval using parameter value
x n
= 55, and = 100.
α
) % is the confidence
n
: sample size
x
: data
Z
Interval when