C= df = 1 c, 1 + (1– c ), Lower = ( o – Casio CLASSPAD 330 3.04 User Manual
Page 451: T 2, 1 + n, 1upper = ( o, T 2 s, 1lower = ( o, 2 + n, Upper = ( o
20090601
When the two population standard deviations are equal (pooled)
When the two population standard deviations are not equal (not pooled)
Definition of Terms
C-Level : confidence level (0 C-Level < 1)
List(1) :
list where sample 1 data is located
List(2) :
list where sample 2 data is located
Freq(1) : frequency of sample 1 (1 or list name)
Freq(2) : frequency of sample 2 (1 or list name)
Pooled : On or Off
M
1
:
sample mean of sample 1 data
s
x
1
:
sample standard deviation of sample 1 (s
x
1
0)
n
1
:
size of sample 1 (positive integer)
M
2
:
sample mean of sample 2 data
s
x
2
:
sample standard deviation of sample 2 (s
x
2
0)
n
2
:
size of sample 2 (positive integer)
Calculation Result Output
Lower :
interval lower limit (left edge)
Upper :
interval upper limit (right edge)
df
:
degrees of freedom
M
1
:
sample mean of sample 1 data
M
2
:
sample mean of sample 2 data
s
x
1
:
sample standard deviation of sample 1
s
x
2
:
sample standard deviation of sample 2
s
p
:
pooled sample standard deviation (Displayed only when pooling is
turned on.)
n
1
:
size of sample 1
n
2
:
size of sample 2
Lower = (
o
1
–
o
2
)– t
2
n
1
+n
2
–2
s
p
2
n
1
1 +
n
2
1
Upper = (
o
1
–
o
2
)+ t
2
s
p
2
n
1
+n
2
–2
n
1
1 +
n
2
1
Lower = (
o
1
–
o
2
)– t
2
n
1
+n
2
–2
s
p
2
n
1
1 +
n
2
1
Upper = (
o
1
–
o
2
)+ t
2
s
p
2
n
1
+n
2
–2
n
1
1 +
n
2
1
Lower = (
o
1
–
o
2
)– t
df
2
+
n
1
s
x
1
2
n
2
s
x
2
2
Upper = (
o
1
–
o
2
)+ t
df
2
+
n
1
s
x
1
2
n
2
s
x
2
2
Lower = (
o
1
–
o
2
)– t
df
2
+
n
1
s
x
1
2
n
2
s
x
2
2
Upper = (
o
1
–
o
2
)+ t
df
2
+
n
1
s
x
1
2
n
2
s
x
2
2
C
=
df
=
1
C
2
n
1
–1
+
(1–C)
2
n
2
–1
+
n
1
n
1
n
2
s
x
1
2
s
x
1
2
s
x
2
2
C
=
df
=
1
C
2
n
1
–1
+
(1–C)
2
n
2
–1
+
n
1
n
1
n
2
s
x
1
2
s
x
1
2
s
x
2
2
7-10-9
Confidence Intervals