20090601
7-10-6
Confidence Intervals
S
Program, eActivity or Main Application
Command:
OnePropZ Int
:
Command Syntax
C-Level
value,
x
value,
n
value
Input Example:
OnePropZInt 0.99,2048,4040
2-Prop
Z
Interval
Menu:
[Interval]-[Two-Prop
ZInt]
De
s
cription:
This command obtains the confidence interval of the difference between the
proportions of successes of two populations.
The confidence interval is obtained using the following expressions.
The confidence level is 100 (1 –
A
)%.
Lower
=
– –
Z
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
Upper
=
– +
Z
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
n
1
,
n
2
: sample size
x
1
,
x
2
: data
Definition of Term
s
C-Level: confidence level (0
C-Level < 1)
x
1
:
data value (integer,
x
1
0) of sample 1
n
1
:
size of sample 1 (positive integer)
x
2
:
data value (integer,
x
2
0) of sample 2
n
2
:
size of sample 2 (positive integer)
Calculation Re
s
ult Output
Lower : interval lower limit (left edge)
Upper : interval upper limit (right edge)
ˆp
1
:
estimated proportion of sample 1
ˆp
2
:
estimated proportion of sample 2
n
1
:
size of sample 1
n
2
:
size of sample 2
Summary of Contents for ClassPad 330
Page 11: ...20060301 20090601 ClassPad 330 ClassPad OS Version 3 04 ...
Page 277: ...20060301 3 3 10 Storing Functions 3 Tap AND Plot OR Plot ...
Page 779: ...20090601 S Graph Line Clustered C S Graph Line Stacked E 13 9 2 Graphing ...
Page 780: ...20090601 S Graph Line 100 Stacked F S Graph Column Clustered G 13 9 3 Graphing ...
Page 781: ...20090601 S Graph Column Stacked I S Graph Column 100 Stacked J 13 9 4 Graphing ...
Page 782: ...20090601 S Graph Bar Clustered K S Graph Bar Stacked 9 13 9 5 Graphing ...
