299
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u2-Prop Z Interval
2-Prop Z Interval uses the number of data items to calculate the confidence
interval for the defference between the proportion of successes in two populations.
The following is the confidence interval. The value 100 (1 –
α) % is the confidence
level.
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 operations 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)
Confidence Interval 18 - 7
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