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20050401
o .................................. mean of sample
x
σ
n-1 ............................. sample standard deviation (x
σ
n-1 > 0)
n .................................. size of sample (positive integer)
After setting all the parameters, use c to move the highlighting to “Execute” and then press
the function key shown below to perform the calculation.
•1(CALC) ... Performs the calculation.
Calculation Result Output Example
Left .............................. confidence interval lower limit (left edge)
Right............................ confidence interval upper limit (right edge)
o .................................. mean of sample
x
σ
n-1 ............................. sample standard deviation
n .................................. size of sample
uu
uu
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. α is the level of significance.
The value 100 (1 –
α) % is the confidence level.
Left = (o
1
– o
2
)– t
α
2
Right = (o
1
– o
2
)+ t
α
2
n
1
+n
2
–2
n
1
1
+
n
2
1
x
p
n–1
2
σ
n
1
+n
2
–2
n
1
1
+
n
2
1
x
p
n–1
2
σ
x
p n–1
=
σ
n
1
+ n
2
– 2
(n
1
–1)x
1
n–1
2
+(n
2
–1)x
2
n–1
2
σ
σ
6-6-9
Confidence Interval