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298
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u2-Prop Z Interval
2-Prop Z Interval calculates the confidence interval when the proportions of two
samples are known. The 2-Prop Z Interval is applied to standard normal distribu-
tion.
The following is the confidence interval.
Left = – – Z
α
2
x
1
n
1
x
2
n
2
n
1
n
1
x
1
1–
n
1
x
1
+
n
2
n
2
x
2
1–
n
2
x
2
Right = – + Z
α
2
x
1
n
1
x
2
n
2
n
1
n
1
x
1
1–
n
1
x
1
+
n
2
n
2
x
2
1–
n
2
x
2
n1, n2 : sample size
x1, x2 : data
Perform the following key operation from the statistical data list.
4(INTR)
1(Z)
4(2-P)
Data is specified using parameter specification. The following shows the meaning
of each item.
C-Level........... confidence level (0 < C-Level < 1)
x1 .................... sample 1 data value (x1 > 0)
n1 .................... sample 1 size (positive integer)
x2 .................... sample 2 data value (x2 > 0)
n2 .................... sample 2 size (positive integer)
Execute .......... Executes a calculation
Example To calculate the 2-Prop Z Interval using parameter value
specification
For this example, we will obtain the 2-Prop Z Interval when
C-Level = 0.95,
x1 = 49, n1 = 61, x2 = 38 and n2 = 62.
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1(CALC)
Left ................. interval lower limit (left edge)
Right............... interval upper limit (right edge)
18 - 7 Confidence Interval
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