176
Chapter 8: Statistics & Regression Calculations
3. Press
@
h
.
Answerswillbedisplayedon
thescreen,whereP
^
indicates
the calculated success rate
of the data combined with
sample data 1 and 2, and
P
^
1
andP
^
2
show the success rates of sample data 1 and 2,
respectively. n
1
and n
2
are positive integers.
12 Zint1samp Findsthecondenceintervalofapopulationmean,
µ
.
Example
The average weight of a newly developed product is known to be
52.4 g and standard deviation (
s
)is4.5.Giventheaverageweight
of 20 units is 53.4 g (x), find the confidence interval of the data
wherethelevelofcondence(C-level)is0.95.
Settheinputmethodtovalueinputmode
1. Press
#
S
E
1
7
E
.
2. Press
S
E
1
2
.
The parameter input screen will appear.
3. Enter the appropriate value
into each field.
4. Press
@
h
.
Answerswillbedisplayed
on the screen, where the
numerical value within ()
indicates the confidence
interval with the level of
confidence at 0.95, that is, the confidence interval of this sample
datawiththecondencelevelof95%isbetween51.427…and
55.372….
C-levelindicatesthelevelofcondenceandnisapositive
integer.
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