Sharp EL-9900 Operation Manual page 185

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, σ
data.)
Set the input method to value input mode
1. Press # S E 1 7 E.
2. Press S E 1 3.
3. Enter the appropriate value
4. Press @ h.
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.
Chapter 10: Statistics & Regression Calculations
= 2.8, n = 20 (x
2 2
Parameter input screen will appear.
into each field.
Answers will be displayed on
the screen, where the
numeric value within ()
indicates the confidence
interval of µ and µ
1
* n and n are positive integers.
1 2
The parameter input screen will appear.
and µ
1 2
_
= 77.3, σ
_ _ 1
and x indicate sample means of two
1 2
at a confidence level of 90%.
2
and µ
1 2
of sample data with the
= 3.4, n = 30 and x
1 1
.
_
=
2
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