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)
ˆ p .................................. 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
