20070201
u 1-Prop Z Interval
1-Prop Z Interval uses the number of data to calculate the confi dence interval for an
unknown proportion of successes.
The following is the confi dence interval.
α is the level of signifi cance. The value 100 (1 – α)
% is the confi dence level.
n : size of sample
x : data
Perform the following key operations from the statistical data list.
4(INTR)
1(Z)
3(1-P)
Data is specifi ed using parameter specifi cation. The following shows the meaning of each
item.
C-Level ......................... confi dence level (0 < C-Level < 1)
x .................................. data (0 or positive integer)
n .................................. size of sample (positive integer)
Save Res ..................... list for storage of calculation results (None or List 1 to 26)
Execute ........................ executes a calculation
After setting all the parameters, use c to move the highlighting to “Execute” and then press
the function key shown below to perform the calculation.
• 1(CALC) ... Performs the calculation.
Calculation Result Output Example
Left ............................... confi dence interval lower limit (left edge)
Right ............................. confi dence interval upper limit (right edge)
ˆp .................................. estimated sample proportion
n .................................. size of sample
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–
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–
6-6-6
Confi dence Interval
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