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Finds the confidence bound of two sample means µ
13 Zint2samp
Example
Find the confidence interval of µ
confidence level of 0.9, where x
= 75.2, s
data.)
Set the input method to value input mode
1. Press # S E 1 7 E.
2. Press S E 1 3.
Parameter input screen will appear.
3. Enter the appropriate value
into each field.
4. Press @ h .
Answers will be displayed
on the screen, where the
numeric value within ()
indicates the confidence
interval of µ
* n
14 Zint1prop
Finds the confidence interval of the success probability of a
population from the success probability obtained from sample data
collected from a population.
Example
A coin was tossed 100 times and landed head side up 42 times.
Normally, the probability of head facing up is 0.5. Find the
confidence interval of the success probability at a confidence level
of 0.95.
1. Press S E 1 4.
The parameter input screen will appear.
Chapter 8: Statistics & Regression Calculations
_
= 2.8, n
= 20 (x
and x
2
2
1
and µ
at a confidence level of 90%.
1
2
and n
are positive integers.
1
2
and µ
1
and µ
of sample data with the
1
2
_
= 77.3, s
= 3.4, n
= 30 and x
1
1
1
_
indicate sample means of two
2
.
2
_
2
177
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