Sharp el-9950 - Page 178

177
Chapter 8: Statistics & Regression Calculations
13 Zint2samp Findsthecondenceboundoftwosamplemeans
µ
1
and
µ
2
.
Example
Findthecondenceintervalof
µ
1
and
µ
2
of sample data with the
confidence level of 0.9, where x
_
1
= 77.3,
s
1
= 3.4, n
1
= 30 and x
_
2
= 75.2,
s
2
= 2.8, n
2
= 20 (x
_
1
and x
_
2
indicate sample means of two
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
1
and
µ
2
atacondencelevelof90%.
* n
1
and n
2
are positive integers.
14 Zint1prop Findsthecondence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.