Sharp EL-9900 - Manual (Page 186)

176
Chapter 10: Statistics & Regression Calculations
2. Enter the appropriate value
into each field.
3. Press @ h.
Answers will be displayed on
the screen, where the
numerical value within ()
indicates the confidence
interval of the success probability at a confidence level of
95%.
* n is a positive integer.
15 Zint2prop Finds the confidence interval of the difference (P
1
-P
2
) of the
success probability obtained from the two sets of sample data
collected from two different populations.
Example
Find the confidence interval of the success probability (P
1
, P
2
) at
a confidence level of 0.9 for the two sets of sample data n
1
= 50,
x
1
= 16 and n
2
= 20, x
2
= 5.
1. Press S E 1 5.
The parameter input screen will appear.
2. Enter the appropriate value
into each field.
3. Press @ h.
4. Answers will be displayed on
the screen, where the
numerical value within ()
indicates the confidence
interval of the success probability P
1
-P
2
at a confidence level
of 90%.
* n
1
and n
2
are positive integers.