188
CHAPTER 7
for US
[12 Zint1samp]
Finds the confidence bound of the population mean, µ, when the value of the popula-
tion standard deviation, σ, from sample data collected from a population, is known.
<Example 12>
Here, we will find the confidence bound of the sample data from example 8 (µ) when
the level of confidence (C-level) is 0.95.
1. Set to the numerical value input mode (InputStat).
2. Press E 1 2 to input each parameter (as
shown to the right).
3. Press
Ï
to solve (as shown to the right).
The numerical value within () indicates the confidence
bound with the level of confidence at 0.95.
In other words, the confidence bound of this sample
data with the confidence level at 95% is between
51.428… and 55.372….
* C-level indicates the level of confidence.
* “n” is a positive integer.
[13 Zint2samp]
Finds the confidence bound of two sample means, “µ
1
, µ
2
”, when each population
standard deviation, “σ
1
, σ
2
”, from two sets of sample data collected from two different
populations, are known.
<Example 13>
Here, we will find the confidence bound of µ
1
and µ
2
using contents from example 9
with the confidence level at 0.9.
1. Set to the numerical value input mode (InputStat).
2. Press
E 1 3 to input each parameter (as
shown to the right).
EL-9650-(07)En (178-196) 8/1/00, 9:08 AM188
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