300
ˆp 1 .................... estimated sample propotion for sample 1
ˆp 2 .................... estimated sample propotion for sample 2
n1 .................... sample 1 size
n2 .................... sample 2 size
kk
kk
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
uu
uu
u1-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
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