Casio fx-9750G PLUS - Manual (Page 326)

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.
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1 (CALC)
Left ................. interval lower limit (left edge)
Right ............... interval upper limit (right edge)
ˆp ..................... estimated sample proportion
n ..................... sample size
18 - 7
Confidence Interval