Casio FX-9750G plus User Manual page 328

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Confidence Interval
ˆ p
.................... estimated sample propotion for sample 1
1
ˆ p
.................... estimated sample propotion for sample 2
2
n
.................... sample 1 size
1
n
.................... sample 2 size
2
k k k k k t Confidence Interval
You can use the following menu to select from two types of
• {1-S}/{2-S} ... {1-Sample}/{2-Sample}
u u u u u 1-Sample t Interval
t
1-Sample Interval calculates the confidence interval for an unknown population
mean when the population standard deviation is unknown.
The following is the confidence interval. The value 100 (1 –
level.
Left = o– t
n – 1
Right = o+ t
n – 1
Perform the following key operations from the statistical data list.
4(INTR)
t
)
2(
1(1-S)
The following shows the meaning of each item in the case of list data specifica-
tion.
Data ................ data type
C-Level ........... confidence level (0 < C-Level < 1)
List .................. list whose contents you want to use as sample data
Freq ................ sample frequency
Execute .......... execute a calculation
The following shows the meaning of parameter data specification items that are
different from list data specification.
o ..................... sample mean
x σ
................ sample standard deviation (
n
-1
n
..................... sample size (positive integer)
manuals search engine
t
Interval
σ
α
x
n–1
2 n
σ
α x
n–1
2
n
t
confidence interval.
α
) % is the confidence
x σ
> 0)
n
-1