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o
.................................. mean of sample
x
............................. sample standard deviation (
n
-1
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
............................. sample standard deviation
n
-1
n
.................................. size of sample
u u u u u 2-Sample
t
Interval
t
2-Sample
Interval calculates the confidence interval for the difference between two
population means when both population standard deviations are unknown. The
t
applied to
distribution.
The following confidence interval applies when pooling is in effect. The value 100 (1 – ) % is
the confidence level.
Left = (o
Right = (o
=
x
p
n–1
1-3-9
Confidence Interval (INTR)
– o
)– t
x
n
+n
–2
1
2
2
1
2
– o
)+ t
1
2
n
+n
–2
2
1
2
(n
–1)x
+(n
–1)x
2
1
1
n–1
2
n
+ n
– 2
1
2
20011101
20010101
x
> 0)
n
-1
1 +
1
2
n
n
p
n–1
1
2
1
1 +
x
2
n
n
p
n–1
1
2
2
2
n–1
t
interval is
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