20090601
Input Example:
Syntax 1 (list format)
TwoSampleZInt 0.95,15.5,13.5,list1,list2,1,1
Syntax 2 (parameter format)
TwoSampleZInt 0.95,1,1.5,418,40,402,50
1-Prop
Z
Interval
Menu: [Interval]-[One-Prop ZInt]
Description: This command obtains the confidence interval of the proportion of successes
in a population.
The confidence interval is obtained using the following expressions.
The confidence level is 100 (1 –
A
)%.
n
: sample size
x
: data
Definition of Terms
C-Level: confidence level (0
C-Level < 1)
x
: data (0 or positive integer)
n
: sample size (positive integer)
Calculation Result Output
Lower : interval lower limit (left edge)
Upper : interval upper limit (right edge)
ˆ p
: estimated sample proportion
n
: sample size
Example
Data : 2048
Sample size : 4040
Significance level : 1% ( = confidence level : 99%)
• Statistics Wizard Operation
(1) On the menu bar, tap [Calc] and then [Interval].
(2) Select [One-Prop ZInt] and then tap [Next >>].
(3) Input values.
(4) Tap [Next >>].
2
Lower = – Z
x
n
n
1
n
x
n
x
1–
Upper = + Z
x
n
2
n
1
n
x
n
x
1–
2
Lower = – Z
x
n
n
1
n
x
n
x
1–
Upper = + Z
x
n
2
n
1
n
x
n
x
1–
7-10-5
Confidence Intervals
