Casio fx-3650P

37
27 Confidence Intervals
For a random sample of size from normal distribution with known variance , the
confidence intervals for the population mean may be calculated as given by:
(90% confidence interval)
(95% confidence interval)
(99% confidence interval)
: sample mean
Program
？→ Ａ： －１．９６×√（Ａ ÷ ）→ Ｂ： ＋１．９６×√（Ａ ÷ ）→ Ｃ：Ｂ Ｃ
＜ 39 STEP ＞
: :
INPUT Ａ: Population variance
OUTPUT Ｂ,Ｃ: 95% confidence interval
Execution Example:
Calculate 95% confidence intervals.
Data: 1.4, 1.5, 1.3, 1.4, 1.7, 1.5, 1.3 Population variance
The interval of 95% certainty for is:
１．３３８＜ ＜１．５４８
n σ
2
µ
x 1.64
σ
n
-------
×– µ x 1.64
σ
n
-------
×+<<
x 1.96
σ
n
-------
×– µ x 1.96
σ
n
-------
×+<<
x 2.57
σ
n
-------
×–
µ x 2.57
σ
n
-------
×+<<
x
ON
MODE MODE MODE
1
PRGM
MODE MODE
1
SD
1
P1
x nx n
x
SHIFT
2
S-VAR
1
x
n
SHIFT
1
S-SUM
3
n
σ
2
B µ C<<
σ
2
0.02=
µ
µ
MODE MODE
1
SD
SD
S A
D R P1
P1
P2 P3 P4 G
1 4
M+
DT
SD
S A
D R P1
P1
P2 P3 P4 G
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