Casio STAT 2, Руководство пользователя

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39
o
.................................. mean of sample
x
"
n
-1
............................. sample standard deviation (
x
"
n
-1
> 0)
n
.................................. size of sample (positive integer)
After setting all the parameters, align the cursor with [Execute] and then press the function
key shown below to perform the calculation.
• 1 (CALC) ... Performs the calculation.
Calculation Result Output Example
Left .............................. interval lower limit (left edge)
Right ............................ interval upper limit (right edge)
o
.................................. mean of sample
x
"
n
-1
............................. sample standard deviation
n
.................................. size of sample
u u
u u u
2-Sample
t
Interval
2-Sample
t
Interval calculates the confidence interval for the difference between two
population means when both population standard deviations are unknown. The
t
Interval is
applied to
t
distribution.
The following confidence interval applies when pooling is in effect. The value 100 (1-
!
) % is
the confidence level.
Left =
( o
1
–
o
2
)
– t
!
2
Right = (
o
1
–
o
2
) + t
!
2
n
1
+ n
2
– 2
n
1
1 +
n
2
1
x
p n – 1
2
"
n
1
+ n
2
– 2
n
1
1 +
n
2
1
x
p n
– 1
2
"