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Example
Data1 : 49, sample size : 61
Data2 : 38, sample size : 62
Significance level : 5% ( = confidence level : 95%)
• Stati tic Wizard Operation
(1) On the menu bar, tap [Calc] and then [Interval].
(2) Select [Two-Prop ZInt] and then tap [Next >>].
(3) Input values.
(4) Tap [Next >>].
Program, eActivity or Main Application
Command: TwoPropZInt
Command Syntax
C-Level value,
Input Example:
TwoPropZInt 0.95,49,61,38,62
t
Confidence Interval
t
1-Sample
Interval
Menu:
[Interval]-[One-Sample TInt]
De cription: This command obtains the confidence interval for the population mean when
the population standard deviation is unknown.
The confidence interval is obtained using the following expressions.
The confidence level is 100 (1 – )%.
Lower = o– t
Lower = o– t
Upper = o+t
Upper = o+t
Definition of Term
C-Level : confidence level (0
List :
list where sample data is located
Freq :
frequency of sample (1 or list name)
:
sample mean
s
:
sample standard deviation (s
x
n
:
sample size (positive integer)
7-10-7
Confidence Intervals
x
n
x
value,
value,
value,
1
1
2
s
s
x
x
n – 1
n – 1
2
2
n
n
s
s
x
x
n – 1
n – 1
2
2
n
n
C-Level < 1)
20090601
n
value
2
0)
x
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