Casio Algebra FX 2.0 PLUS User Manual page 43

.................................. mean of sample
o
x σ
............................. 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)
.................................. mean of sample
o
x σ
............................. sample standard deviation
n -1
n
.................................. size of sample
t
u u u u u 2-Sample 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 –
the confidence level.
Left = (o
Right = (o
σ
=
x
p n–1
1-3-9
Confidence Interval (INTR)
α
)– t
– o x
n +n –2
1 2 2
1 2
α
– o )+ t
–2
1 2 n +n
2
1 2
σ
(n –1)x +(n –1)x
2
1 1 n–1 2
+ n – 2
n
1 2
20011101 20010101
x σ
> 0)
n -1
1 + 1
σ
2
n n
p n–1
1 2
1 + 1
σ
x
2
n n
p n–1
1 2
σ
2
2 n–1
t
interval is
α
) % is