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Chapter 8: Statistics & Regression Calculations
3. Press @ h .
12 Zint1samp
Finds the confidence interval of a population mean, µ.
Example
The average weight of a newly developed product is known to be
52.4 g and standard deviation (s) is 4.5. Given the average weight
of 20 units is 53.4 g (x), find the confidence interval of the data
where the level of confidence (C-level) is 0.95.
Set the input method to value input mode
1. Press # S E 1 7 E.
2. Press S E 1 2.
3. Enter the appropriate value
4. Press @ h .
176
Answers will be displayed on
^
the screen, where P
indicates
the calculated success rate
of the data combined with
sample data 1 and 2, and
^
^
P
and P
show the success rates of sample data 1 and 2,
1
2
respectively. n
and n
are positive integers.
1
2
The parameter input screen will appear.
into each field.
Answers will be displayed
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
data with the confidence level of 95% is between 51.427... and
55.372....
C-level indicates the level of confidence and n is a positive
integer.
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