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Example 2 (calculation with parameter)
Mean : 300
Sample size : 6
Population standard deviation : 3
Significance level : 5% ( = confidence level : 95%)
• Statistics Wizard Operation
(1) On the menu bar, tap [Calc] and then [Interval].
(2) Select [One-Sample ZInt] and [Variable], and then
tap [Next >>].
(3) Input values.
(4) Tap [Next >>].
u
Program, eActivity or Main Application
Command: OneSampleZInt
Command Syntax
Syntax 1 (list format)
C-Level value,
σ
value, List, Freq (or 1)
* “Freq” can be omitted. Doing so sets “1” for “Freq”.
Syntax 2 (parameter format)
C-Level value,
σ
value,
o
value,
n
value
Input Example:
Syntax 1 (list format)
OneSampleZInt 0.95,3,list1,1
Syntax 2 (parameter format)
OneSampleZInt 0.95,3,300,6
2-Sample
Z
Interval
Menu: [Interval]-[Two-Sample ZInt][Interval]-[Two-Sample ZInt]Two-Sample ZInt]-Sample ZInt]Sample ZInt] ZInt]ZInt]]
Description: This command obtains the confidence interval for the difference between
population means when the population standard deviations of two populations
are known.
The confidence interval is obtained using the following expressions.
The confidence level is 100 (1 –
α
)%.
Left = (o
1
– o
2
) – Z
α
2
Right = (o
1
– o
2
) + Z
α
2
n
1
1
2
σ
+
n
2
2
2
σ
n
1
1
2
σ
+
n
2
2
2
σ
o
1
: sample mean of sample 1 data
o
2
: sample mean of sample 2 data
σ
1
: population standard deviation of
sample 1
σ
2
: population standard deviation of
sample 2
n
1
: size of sample 1
n
2
: size of sample 2
7-10-3
Confidence Intervals
20070301