Sharp el-9950

175
Chapter 8: Statistics & Regression Calculations
10 Ztest1prop TeststhesuccessprobabilityP
0
of 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.Testtoseeifthe
coin is fair.
1. Press
S
E
1 0
.
The parameter input screen will appear.
• propisthehypothesisprobability.Thetestwillbeconducted
using hypothesis prop
≠
P
0
.
• xisthenumberofsuccessesobservedandnisthenumber
of trials (where n is a positive integer.)
2. Enter the appropriate value
into each field.
3. Press
@
h
.
p
^
:Successprobability
obtained from the sample
data.
11 Ztest2prop Executesacomparativetestfortwosuccessprobabilities,(P
1
,P
2
).
Example
TesttheequalityofP
1
andP
2
given the sample data n
1
= 50, x
1
=
16 and n
2
= 20, x
2
=5,wherethehypothesisisP
1
<P
2
.
1. Press
S
E
1 1
.
The parameter input screen will appear.
2. Enter the appropriate value
into each field.