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297
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u1-Prop Z Interval
1-Prop Z Interval uses the number of data to calculate the confidence interval
when the proportion is not known. The 1-Prop Z Interval is applied to standard
normal distribution.
The following is the confidence interval.
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 operation 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 ..................... expected p-value
n ..................... sample size
Confidence Interval 18 - 7
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