Casio CFX-9970G User Manual page 320

18 - 7
Confidence Interval
Example
u u u u u 2-Sample t Interval
2-Sample
between the means of two samples is known. The
distribution.
The following confidence interval applies when pooling is in effect.
The following confidence interval applies when pooling is not in effect.
To calculate the 1-Sample
For this example, we will obtain the 1-Sample
= {11.2, 10.9, 12.5, 11.3, 11.7} when C-Level = 0.95.
1(List)c
a.jfw
1(List1)c
1(1)c
1(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
t
Interval calculates the confidence interval when the difference
Left = (o – o )– t
n +n
1 2
1 2
– o
Right = (o )+ t
1 2 n +n
1
– o
Left = (o )– t
1 2
df
– o
Right = (o )+ t
1 2 df
1
df =
2
(1–C)
2
C
+
n –1 n –1
1 2
x
%
2
1 n–1
n
1
C =
x
x %
%
2 2
2
1 n–1 n–1
+
n n
1 2
t
Interval for one list of data
)
1 +
x
%
2
n
–2
p n–1
2
1
)
1 +
x
%
2
n
–2
p n–1
2
2
1
x
x %
%
) 2
2
1 n–1 n–1
+
n n
2
1 2
x x
% %
) 2
1 2 n–1
n–1 +
n
n
2
2
1
t
Interval for data
t
Interval is applied to
1
n
2
1
n
2
2
2
t
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