Casio fx-9750G PLUS - Manual (Page 328)

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ˆp
1
.................... estimated sample propotion for sample 1
ˆp
2
.................... estimated sample propotion for sample 2
n
1
.................... sample 1 size
n
2
.................... sample 2 size
k k k k k t Confidence Interval
You can use the following menu to select from two types of t confidence interval.
• { 1-S}/{2-S} ... {1-Sample}/{2-Sample} t Interval
u u u u u 1-Sample t Interval
1-Sample t 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 –
α
) % is the confidence
level.
Left = o– t
n – 1
α
2
Right = o+ t
n – 1
α
2
x
n –1
σ
n
x
n –1
σ
n
Perform the following key operations from the statistical data list.
4 (INTR)
2 ( t )
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
n -1
................ sample standard deviation ( x σ
n -1
> 0)
n ..................... sample size (positive integer)
18 - 7
Confidence Interval