Casio fx-9860G SD User Manual page 339

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
............................. sample standard deviation
n
-1
n
.................................. size of sample
u u u u u 2-Sample Z Interval
2-Sample Z Interval calculates the confidence interval for the difference between two
population means when the population standard deviations of two samples are known.
The following is the confidence interval.
% is the confidence level.
Left = (o
Right = (o
Perform the following key operations from the statistical data list.
4(INTR)
1(Z)
2(2-S)
6-6-4
Confidence Interval
(Displayed only for Data: List setting.)
is the level of significance. The value 100 (1 – )
2
– o 1
) – Z +
1 2
n
2
1
2
– o 1
) + Z
1 2
n
2
1
20050401
o
: mean of sample 1
2
1
2
o
: mean of sample 2
n 2
2
: population standard deviation
1
2
of sample 1
2
+
n
: population standard deviation
2
2
of sample 2
n
: size of sample 1
1
n
: size of sample 2
2