Casio ALGEBRA FX2.0 Advanced Statistics Examples 2 User Manual
Page 14
39
examples
○ ○ ○ ○ ○
Example
Factory A and Factory B both manufacture the same item. To compare
the productivity of the two factories, the production data shown below
was collected for 10 items at Factory A and nine items at Factory B.
Factory A: 78, 80, 79, 83, 82, 85, 78, 74, 76, 84
(kg/h)
Factory B: 81, 84, 82, 88, 86, 83, 78, 84, 89
(kg/h)
Construct a 95% confidence interval for the difference between
µ
1
and
µ
2
when the following is assumed:
σ
1
2
=
σ
2
2
is uncertain, Factory A
population distribution is N(
µ
1
,
σ
1
2
), and Factory B population
distribution is N(
µ
2
,
σ
2
2
).
Procedure
1
m
STAT2
2 hi
wiawhjwidwicw
if
whiwhewhgwiew
e
ib
wiewicwiiwigw
id
whiwiewijw
3
4
(INTR)
c
(T)
c
(2-Smpl)
4
1
(LIST)
c
.jf
w
1
(LIST)
b
wc
1
(LIST)
c
wc
1
(1)
c
1
(1)
c
2
(Off)
c
1
(None)
c
4
1
(CALC)
Result Screen
Thus, the 95% confidence interval for
µ
1
-
µ
2
becomes -7.4<
µ
1
-
µ
2
<-0.6 .