Casio CFX-9970G User Manual page 315

Example To calculate the 1-Sample
For this example, we will obtain the
{11.2, 10.9, 12.5, 11.3, 11.7}, when C-Level = 0.95 (95% confi-
dence level) and % = 3.
1(List)c
a.jfw
dw
1(List1)c1(1)c1(CALC)
Left ................. interval lower limit (left edge)
Right ............... interval upper limit (right edge)
o
..................... sample mean
x
................ sample standard deviation
%
n -1
n
..................... sample size
u u u u u 2-Sample Z Interval
2-Sample Z Interval calculates the confidence interval when the standard
deviations of two samples are known.
) – Z )
– o
Left = (o
1 2
) + Z )
– o
Right = (o
1 2
Perform the following key operation from the statistical data list.
4(INTR)
1(Z)
2(2-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)
Z
Interval for one list of data
2 2
% %
1 2
+
n n
2
1 2
2 2
% %
1 2
+
n n
2
1 2
Confidence Interval
Z
Interval for the data
o
: sample 1 mean
1
o
: sample 2 mean
2
: population standard deviation
%
1
of sample 1
: population standard deviation
%
2
of sample 2
n
: sample 1 size
1
n
: sample 2 size
2
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